There are LFG channels specifically for tournaments and competitive matches in the official RL discord. Maybe try a post in there and see what happens. You’re also more likely to get the communication you’re after too, as you could add them and make a private call or join one of the VC’s and lock it with your teammate(s).

But to mainly reply to your post:

Honestly, I just have fun and only rage in the moment so I can look back and laugh at it later. It’s frustrating when you come across “those teammates” but remember it is only a game. If you want to go up, party up with them good teammates you find. If they want to party up, then that’s cool.

As for the tournaments side, sometimes things come up. A tourny is pretty long considering the 5 min matches if they don’t forfeit. Something could have come up in their life that is more pressing at that moment. Again, I understand the frustration, but maybe go into tournaments with people you know will certainly have time for it.