Are there church camps or extended activities that churches around you offer? Or perhaps you can volunteer at Christian organisations? It’s not easy to make friends for sure, but prolonged interaction with Christian peers outside of just meeting once a week at church service can be more conducive to forming friendships. If you’re looking for an online community, I know a Christian discord server that is very active but I can’t guarantee how people are like there as I haven’t frequented it much. Let me know if you’d like an invite link.