play a hero that can look after themselves. i was always a reinhardt main around 2400, had a bad losing streak went as low as 1800ish and playing rein is pointless at that level. I decided to start maining dps (soldier and tracer) and have been climbing ever since, now ive reached a career high 2650 or so. Tracer is the way to go, at lower levels it is real easy to carry as her. Once you get the hang of it, with her rewind she rarely needs help from teammates.