I don't know if you know these two, but they seemed interesting to me and I plan to read them sometime later: Marvel Super Extraction Marvel: The king
I tried Marvel Super Extraction and it wasn't too bad so far, though the MC has turned a bit...bloodthirsty. Read through the raws of I am in Marvel up to I think around 180 and the MC turned into the worst parts of a Chinese MC, attacking even the good guys because they don't automatically bend over backwards to give him what he wants so I dropped that. Also looked at Marvelous Dragon Balls(I usually stay away from DB fanfics as they're too much) which is set in MCU and it was pretty fun so far.