Is there a way to fix this??

Me and my two friends have been playing recently, and whenever i go to invite them to party, it says oops, server full, so I disband party, and try to teleport to one of them and it says several full, I would love a way to fix this, so I can play with my friends, like private servers or picking what see er to spawn in, bc it's really annoying, and makes it difficult to chill and play with them