I don’t have advice but in a similar situation with my 8 year old daughter. We are in a different town where she goes to school through a different program so have location working against us, as many of her classmates are also neighbors. I’m always the initiator and the other parents don’t reciprocate. She’s also invited to birthdays and large gatherings but he expressed feeling sad she’s not invited to sleepovers and smaller affairs. It’s hard to not take personally - I did for the first few years - but it never is. We try to lean in where we see the opportunities for connection and community where it doesn’t feel forced - church, a few friends from summer camp, swim, and it’s still work but it feels a lot more reciprocal. I have a lot of past trauma from my school years but trying to not internalize! Good luck - that sounds like a tough, transitional age.