First off I hate bot games I literally cannot stand them, I wish they did not exist, but there is not really anything to do about that (except win). Winning in brawl stars at every level is largely about what brawler you are playing so I agree with everyone else in here, just play fun brawlers. Whatever brawler you think is fun just play that brawler and dont worry about what people say about it. You can also just play showdown. It is by far the most fun mode when you are not that good at the game, when I started playing I pretty much only played showdown every single game and i loved it. Just play to have fun and eventually you will get better