I used to main Moon Knight, Squirrel Girl, Hawkeye, and Starlord. But now I main Mantis. Fellow Mantis mains, give me some tips pls

Now, I'm not solo queuing in comp. I play with 2 people that are pretty good. Not one above all good but pretty good. Those are a few of my recent matches. I think maybe I just need to place my sleep right. And I damage boost my dps and tanks when I need to. And I've also been damage boosting myself. I'm gonna post highlights and show my career or whatever it's called. Let's hope I hit gold 3 tomorrow.