[@Weird Tales] I feel like a lot of suggestions have already been made in this thread.

To address the issue of all these fights turning into ganging up on the villain; add Saibamen, add random members of Frieza's army going forward, use movie lore in addition to the main series. Just... add more people for us to fight.

To address the issue of power levels; the training you do determines your power increase, give us some agency in terms of powering up out characters and don't just give everyone the same flat increase. There'll still be a discrepancy but at least the weaker characters can maybe catch up this way, instead of always being weaker because they didn't start at the cap.