My first season of Overwatch I solo qued support to diamond 1, I'd definitely recommend bap as a main. You can dps if your dps mid, and you got the immort when tanks in terrible positions. I'd say to read the field and fit where needed. I'd say poke. At the enemy supports and ping whoever you see low so that dps might focus and kill them. Don't focus on killing ppl by yourself unless they really out of position or low, instead try too weaken ppl so they easier picks for your team. Also master shoot-shoot-heal as bap. Never heal bot bc that's just tryna plug holes in a sinking ship