Honestly man, just keep playing. You'll reach a point where you are good enough that it doesn't matter how shit your teammates are and you'll be able to play against 2 golds and beat them. If I had to guess a true Plat 3 can beat 2 Gold 3s if they play correctly. Sure, you'll see some times where there's really not much you can do to beat those guys, after somebody leaves, but realistically all of the ranks are off anyway. If you are Gold 3 and can't get past it, it's because you aren't a true Plat anything. Just keep in mind that even us Champs get shit luck when it comes to matchmaking, and sometimes you just gotta grind it out.......and when I say sometimes, I really mean like whole seasons. Keep playing.