Thank your Teammates (if appropriate)
I know I'm not the best, or hell, even good. I have my streaks of good games, and some downright terrible games. In my last game, I didn't get a chance after the game to thank my teammates (because I had to leave quickly IRL). I ended up playing Twitch which I've done on occasion, and no where near "great" at it.
What my team did was help guide me, warn me, etc., so keep the team alive. Sure, if I made a bone-headed move, or got greedy, I owned up to it. No flame, nothing. Owning your own mistakes and helping others in need by shot calling goes a long way. When you set the precedence as a player that you are willing to take suggestions/advice/orders from more experienced players, it definitely sets the stage to help the team out for coordination plays.
That's it. Just a public thank you to my match made team for this game. :)
Grazie.