Heya Anavrin,
If your’e looking for a laid back guild that does M+, AoTC, and has fun with achievement and mount runs then we might be a good fit for you.
We’re a group of adults who treat the game as it should be: a game. There’s no yelling etc if we wipe on a raid boss, we just regroup and try again. It’s a very relaxing atmosphere, we focus on recruiting the person rather than the character.
If that sounds like what you’re looking for, here is our general blurb: [H]Casual/Social Guild LFM
Please feel free to contact any of us listed there if you’d like to chat or get an invite to our discord server so you can get a feel for the group. 
have a good one!