I need some advice

I was silver 3 last season, I know I’m pretty bad. I’ve played on and off for 7 years.

This season I’ve lost 12 games in a row. No matter what I do I’ll die once and get so far behind or my ENTIRE team will int or be useless OR I’ll be up against some Smurf that goes 20/0 and solo carries. I know my biggest issue is I don’t have a main, I play a random champ almost every other game. The best champ I have is malz with 44 games 87% wr but he’s so damn boring and sucks past silver.

I’m tired of being useless, I’m tired of wasting my time and being toxic. Maybe I should uninstall?