Hello Ganolith
I am a returning player. I came back in March. Apparently it had been 7 years since I was last online! I have really enjoyed WoW since then but one of the things I was missing was the social aspect of a Guild. I joined a guild for this xpac that I am really happy with at Tryhardish.
There is a wide variety of experience levels that lead to a more casual atmosphere. But, the officer team is knowledgeable and skilled while being dedicated to forming a positive environment. Avg age is probably in the 30s with a ton of working adults that want to game.
We all love talking about wow and I have received a lot of help while trying to learn the new xpac or any changes from when I played in the past. Then at level cap we are involved with several different end game content mods from raiding to M+s to group delves.
If that sounds like it might be a good fit for you, I invite you to check them out. Cheers,