DanteMustDie
situations like this i would say start to lean toward a more comedic aspect having a serious character this powerful rapidly kills the fic while this is fun to read if you are having trouble in a sense challenging your MC don't focus less on the seriousness of the character and more on the comedy and or unfortunate events he can't brute force his way out of, its why One Punch Man was such a hit it didn't focus on his strength but more on the actual character itself, if you feel you cannot pull that off or are not experienced enough in comedy to write it i dunno man, i am enjoying the fic and its a nice power trip the only things i could say is slow down on the combat and focus on character development
You can just focus on other things that doesnt involve fighting, the majority of op mc stories take that route Examples being: Learning powers from different worlds like magic ninjitsu haki martial arts etc Romance Adventuring (exploring new worlds and interacting with their characters) Collecting your favorite artifacts Slice of life / comedy