Matches aren't fun anymore

I'm sitting at around 45k trophies, trying to push my brawlers to max tier, and it's been absolute hell. Showdown is a nightmare with all the braindead teamers who spin, drop sprays, and gang up on you, so I switched to 3v3 modes instead. But matchmaking is just as frustrating—it pairs me with clueless Edgar mains at 7k trophies while my opponents are sitting at 70-80k. It’s making the game feel completely unplayable. Any advice to make this grind less painful?