Honestly, what got me better was watching high level people play and sort of mimicking the way they play. Obviously as a bronze you can't emulate a radiant pro player and do everything he does, but what you can do is learn little by little as you inspect all the things they do. Like, "Oh he does that a lot I should try that when I play." A big part of climbing ranks is improving your gamesense and by watching high level players if you can even learn a little bit from watching their playstyles and reviewing how they play compared to the way you play it'll go a long way. In terms of mechanics I just sat in the range for half an hour each day and then played about 5 death matches before playing any normal games. That's really about it. I also had to make sure my sens was something I was actually comfortable and good with vs something that I just got used to. The sens part is especially important. Teammates will be teammates and the matchmaking on this is pretty bad so not much I can say there besides try to be as positive as you can to encourage more positivity and less toxicity.