I Need Help Fixing My FPS

Hi, lately my fps has been complete crap on league. Basically what had happened was I bought PUBG and the game was unplayable my frames were so band and I was lagging like hell so I decided to do this thin g where it deletes everything off my pc but my personal files. I did that and re installed everything I needed and ever since then my league frames have gone from 150+ to 60-20 and sometimes my camera gets really choppy and my champions movements get choppy as well. I don't know what to do or how I can fix this. Also PUBG is still unplayable so it hurt more than it helped. Please help me fix my frames. I don't know what is going on all my settings are right so I can't find the problem. Please help and Thank you.

P.S. My camera seems really zoomed in compared to what I had it just thought I would throw that in and ask for help