Throwing in the hat for The Padawans.
We’re mostly Americans and Brits, with other Europeans (and one sole Asian). Our forum recruitment post is here (The Padawans Alliance is friendly and supportive and has 3 open spots - Fighting mostly 10* and 11* titans (green tanks))
We use Discord, but membership is not compulsory. We’re pretty stable, and our core group has been together for about 2 years.