Able I able to fix my iPhone?

Ive had my iPhone for awhile, one day I dropped it on the corner of my phone ( my phone already had cracks on the screen but nothing big.) After dropping it I had a crack on my screen, I didn’t use it for the rest of the day and the next day it started jittering and basically having a mind of its own. Opening apps really fast and typing random letters. Is there something I can do to the phone its self to fix this? I’ve been having this problem for about 6 months.