Have a browse through the communities section, maybe u’ll find something: https://eu.forums.blizzard.com/en/wow/c/recruitment/communities/231
If u want a friendly experience and just want to learn in a nice environment i can recomment the community called «scared of dungeons». Its a bit quiet since its xmas and also middle of a drought period, but there are still keys being done. But please read up about the community and its rules before joining: Scared of Dungeons Alliance