Im hardstuck legendary, need help

Im currently hardstuck legendary 2 and I clearly know my issues, but not the solutions:

I consider myself to be a skilled player overall (Im pretty good at dodging, aiming, environment usage, etc), but my main problems in ranked are: 1) not knowing who to max out 2) not enough knowledge of the best brawlers for each map 3) teammates

I know its hard, but I need a good player to help me out with those problems (the first 2 specifically)

*note: Im f2p, so maxing out brawlers is kind of hard :)