im in the same boat as u i was at 1432 went all the way to 1148 and i had people afk/not connect ppl troll cuz they didnt get a role like dude stop *****ing play a diff role

My recommendation is to take stop for the day after 3 losses in a row.

Besides that always help to improve team morale(I've won games with this alone, and it can deter some from trolling).

From my experience in this elo range the following in this order carries games the hardest: Mid,jungle,adc,top

I put top on the bottom because most of the time I feel my top doesnt understand counter picks or snowballing or trading or basic warding and thus I almost never see one carry my game.

ALso ward your lane if you have the money, don't be the idiot who gets 3 kills mid and doesnt buy at least one ward. It serves the dual purpose to stop the enemy ganks and roaming mid.