Aizawa refuses to let his Problem Child travel back in time alone, even to fix a future where All for One was the victor. They go back with a plan that's more of a list, spend a year technically missing, and become rather effective vigilantes that fix some rather serious problems. And then it's time to be found, which seems to primarily result in lots of support and many hugs. Neither Izuku or Aizawa complain very much.

Midoriya needs a new outlet for his hero research and accidentally creates a viral YouTube channel. Or: Midoriya makes some new friends, learns to fight, and gets into UA and amasses an army of fans that protect him.