I'm tired of this, my friends still can't join my world but I can join theirs

This problem has been around for months maybe years. my friends can join my world but I can't join theirs.I'm so tired of this. Is no one doing anything about this? If you search it up on YouTube many people have the same problem too. I THOUGHT with this new update, this problem will finally be fixed, but no. Come on, do something about this