Reborn as Yamcha: If It Was You, What Would You Do?

After training with Roshi, I would've made sure that Dr. Gero would die at some point before Raditz appears and the spaceship ready with Multiple Gravity Rooms to go to Namek would also be prepared prior to Raditz arriving. I would've helped Goku and Piccolo defeat Raditz too like it's made obvious Goku never died since Kami had to break rules to get Goku to train with King Kai. This would only be the case if Goku was alive when taken to Other World, which the story seemed to heavily imply.

Now another change would happen here, I'd have had Kami take all the Z Fighters to Snake Way so they could all train under King Kai. If everyone knew how to use the Kaio-ken and Spirit Bomb it would have a great impact on future events. Also the 10x Gravity Training would help immensely too. Now instead of sticking around to fully master both techniques, I think 6 months would be enough to learn the techniques and get a basic understanding of them. I'd contact Bulma via King Kai's telepathy and have her summon Shenron with enough time to still go to Namek. I'd have her wish for everyone to be teleported back to Earth, so we could go to Namek. Once there, we'd go to Guru to get our potential unlocked. So now the entire Z Warrior gang has learned the Kaio-ken, Spirit Bomb, and has received the potential unlock. Since we'd still have about 5 months until Vegeta and Nappa appeared, we'd all train with Nail and since we're training with him, we might as well teach him the Kaio-ken too. Now Nail also knows the Kaio-ken. Also Guru having read my/Yamacha's mind, would know about the impending arrival of Frieza and could therefore make some sort of preparations. Maybe have it to where warriors are always present in the village at all times until the arrival of Frieza so they could destroy the Frieza forces scouters when they arrive in the first village that will be attacked.

After having returned to Earth (but not before giving Guru a means to communicate with us back on Earth) with enough time to beat the Saiyans back, myself and the other Z fighters will be plenty strong enough to defeat the Saibamen, Nappa, and Vegeta with ease. I mean Gohan with his potential unlocked with be at least 20K (he had 32K after Guru unlocked it in the main DBZ timeline) and Goku would be even much stronger and this of course would be even before using the Kaio-ken. Now seeing as Vegeta wouldn't be needed due to Gero being dead already, we'd make sure to dispatch him too, but not before destroying his Scouter to ensure that Frieza sticks with the plan to attack Namek to get a head start on Vegeta.

Now soon Guru would be contacting us to let us know that he can sense the Frieza forces approaching the Planet Namek. Everyone still being in top physical shape would then head off to Namek. Of course Frieza would still arrive first. It wouldn't be a problem since his scouters would be disabled. He'd probably be calling the Ginyu Force in earlier as a result, but that would be okay. With everyone getting in some Gravity Training and Sparring to prepare, we'd be plenty powerful enough to stop the Ginyu Forces too especially with the Kaio-ken. Shortly after dispatching the Ginyu Forces, we'd fight Frieza and he'd resort to his Final Form probably much sooner. We could probably all hold him off as Goku charges a Spirit Bomb and the things would play out mostly the same. I'd allow Krillin to be killed so Goku goes Super Saiyan. Gohan probably would be powerful enough to achieve it too, so we could have a Super Saiyan tag team to easily destroy Frieza. Namek wouldn't be destroyed and things would be much better for everyone.

Before leaving Namek, I'd find Ginyu's pod and retrieve the coordinates from it so we could stop on Planet Yardrat to learn the Instant Transmission. After the Z Warriors learn Instant Transmission and return to Earth, I'd let Kami know about Babidi's spaceship hidden deep in the Earth and tell him that it is of utmost importance that the Supreme Kai is informed about this. After discovering this information, it'd be likely that Supreme Kai would wish to thank me and probably wish to see me out of curiosity after he confirms that it's true. I could discuss with him about the Babidi's minions and keep in mind that King Cold likely might be a possible target for Babidi's mind control as well. Supreme Kai could then approach the rest of the Z fighters and we could discuss about the powerful foes that Babidi has under his control. Of course only having 2 Super Saiyans, a handful of Earthlings knowing the Kaio-ken, and a Namekian capable of it too, would be nowhere near enough to take them on, so we'd continue training until a time when the Supreme Kai was confident we could handle them. When Goku contracts the Heart Virus, we'd cure him with a wish from Shenron and then continue our training. I think at some point in time Supreme Kai realizes that the Z Fighters might have what it takes to draw the Z Sword out of the stone. I'd at that point make sure that the Z Sword is broken like in the manga/anime. Elder Kai could then perform a Potential Unlock on all the Z Warriors. After everyone unlocks their Ultimate form, it'd definitely be time to ambush and stop Babidi.

When that time finally arrives to ambush Babidi's ship, I'd say somewhere probably at least a couple years earlier than when it happened in Z. I don't think a full 12 years of training would be required. We'd again easily dispatch our foes with the slightest of ease. Babidi and his minions would be no match for the Ultimate Z Warriors that all know Kaio-ken, Spirit Bomb, and Instant Transmission. Not even Majin King Cold would improve his chances. With no Majin Vegeta to help awaken Buu, we'd stop Buu from being awakened and that would be that.

Things would then proceed peacefully for Earth. With no Vegeta, there wouldn't be enough Saiyans for a God Ritual and at the very least Beerus wouldn't wake up so early. It's possible that after Gohan and Videl and Goku and Chi-Chi have more offspring that he might appear then. If there were ever enough Saiyans existing to perform the ritual then the prophecy still would've predicted the Super Saiyan God, but just not as soon, so he'd only wake up at that later point.

King Cold having never been killed until much later would mean that Frieza's empire would've been absorbed by him and therefore Frieza would never be revived by Sorbet.

Hypothetically let's say Goku has a 3rd child and Gohan a 2nd child, this probably wouldn't be until at least 5 or 10 years after Z's end. At that point Beerus would appear and both Goku and Gohan would be much much stronger. So whichever of them becomes the SSJG, would easily defeat Beerus. The U6 vs U7 Tournament would still probably happen.

The U6 vs U7 Tournament team for U7 would probably be Goku, Gohan, Goten (22-27 years old), Pan (10-15 years old), and Piccolo. Damn by this point, I think they'd basically have 4 SSJBs and Piccolo on the team and U6 would be utterly wrecked.

No Gero or Vegeta means no Future Timeline, so no Goku Black Arc. Goku would eventually ask Zeno-Oh about the Tournament of Power (of course he doesn't refer to it by that name when asking). Goku, Gohan, and Goten would probably be the members for the Exhibition Match.

No Vegeta, no revived Frieza, and no Buu (no Uub as well) means they wouldn't be on the U7 Team for the ToP. The team would probably not change too much though. Goten and Pan being old enough to participate would probably replace Vegeta and Buu/Frieza's spots. Well now we're caught up to the events of DBS (tho some happening quite a bit later), I think that would be it for how things would differ if I had been Reborn as Yamcha.