I think I broke my phone...

Okay so im an idiot, I thought installing alot of apps and uninstalling them repairs the damage, and I tend to dowload alot of apps and read recently it doesnt .. My phone is hardly like 3 years old and it glitches like shit, not like the screen freezes but the screen kinda moves by itself then i gotta turn off the screen and 2 mins later back to normal... I am very careful about the storage management, I manage all apps and cache so excess storage aint the issue I gotta make it stop cause if something happens to this phone my parents won't let me fix or buy me another... factory reset is not an option... Plzz suggest some ways to get my phone back to normal ... I own a first hand Samsung Galaxy A06...