I don't know if we are the right fit for you, but Rey's_Raiders has 5 open spots on our Squad.
We are Level50, active but not militantly so. We war 2-3 times per week, and most of our members are HQ10 with a few lower levels, too. We're casual and have fun, but we know what we're doing (donating, filling war SCs, etc.). Most of us have been together for 2 years. We don't use LINE or Slack. We manage fine with in-game chat.
Feel free to stop by and a take a look.
Search "Rey" and we come up first.
Mark - Leader of Rey's_Raiders, Kram1 and Kram2 accounts.