For what it’s worth (and I’m definitely similar to this when I play games like Overwatch), I feel that the lack of voice or text communication does insulate you against feeling like a failure. Plus, there’s a lot of room for being proactive in the Ranked modes—moreso than Turf War, to be honest. If you want to be bold (particularly in Rainmaker, but also in the other modes too), there’s scope for your own initiative to be massively important in the win, but it’s also important to just be there, getting in chips and laying down the ink.
I know this isn’t the most helpful thing in the world, but I would really encourage people to jump in and give it a go. It’s by far and away my best experience in any kind of competitive/ranked game mode in any game, ever. No exaggeration!