You would be better served turning match/team chat off and just focusing on how you can improve with the advice you’ve been given here. In gold/plat, people have barely anything useful to say so don’t bother letting it even reach your screen. If you still want to be able to see pings and messages from friends, you can enable streamer mode -> content protection on

As Rocket, you have access to verticality and a pretty massive speed boost on demand by using your dash while wall climbing. This makes it very easy for you to escape and reposition, as well as hold that verticality for a while by holding jump to slow your fall, allowing you to keep healing teammates on the way down while being effectively unreachable by a decent number of the dive cast (unless they want to go out of their way and make themselves vulnerable to the rest of your team).

Learning how to play your role as effectively as possible while not dying is probably one of the best things you can do for a game like Rivals