Stop flaming your team for feeding
unless you're 14/0 with 175+ cs in 20 minutes, you shouldn't be complaining. Fix your mistakes before you point out other people's. thats how I began to climb in overwatch, csgo, and League (currently gold, not on this acc). Just stop looking at your team in general. If you know they're going to make you mad, don't flame. don't do it to yourself. Don't do it to them. They probably feel awful about doing so poorly, so there's no need to call them out and make them mad.
There's always something you can do better.
and if you're the one getting flamed, just mute fam.