To improve playing with people, hang out with fun, go to the tournament, etc.
I have been playing a Rocket league for 3 years and I am looking for a team of my rank:
1v1: Diamond3 or Champion1
2v2: Champion2 or Champion3
3v3: Champion1 or Champion2
This team is no longer recruiting new players. You can either wait until their next recruitment campaign, or become premium to apply in their waiting list. This way, they'll be notified that you're interesting in joining them.