The aftermath of the deciding battle

In this world, villains beat Goku to death, and destroyed the dragon balls, meaning no one can be revived anymore, and it’s up to you. Yamcha, that’s right Yamcha, your the last one left, only piccolo, krillin, and minor characters are left, you have been with the Kai’s, trying to get your hidden potential similar to the way Gohan did in the buu saga