I would suggest just needed an alliance. Im in this one right now and we accept level 10+. If you can tell me your username ill send you a friend request and ask our alliance leader if you can join. Discord is not a must but there is a discord alliance chat for raids etc.
I’d be more than happy to invite you to mine. Shoot me a friend request in discord if you are interested. We have plenty of high level players. Are very active and participate in all tournaments and raids. Let me know if you are interested. Discord is Dartanyo#5204
When you said a 10/10 alliance, did you mean 10/10 weekly incubators? Cuz that would be the opposite of a casual alliance, lol. With that said, my alliance gets 9/10 (so, close enough!) with Tier 6 in tournaments. We will be glad to have you as long as you are active on Discord!