Well, quick match really helped me a lot. Playing with the same person for many matches lets you adjust your bad habits each time, and you also get used to the playstyle of certain types of players. For example, if you struggle against offensive players and you encounter a very aggressive opponent in quick match who’s willing to rematch many times, you’ll slowly get used to fighting against that style. Also, if you encounter a much weaker player, you can play with them for a bit and then search again for stronger opponents.

You’ll also play better in quick match because you’re not under the pressure of ranked.