Well the first one that springs to my mind is Firebrand Enterprises.
I’m not in the guild but I’ve spoken with one of their officers (I sadly can’t remember which one) and they were super friendly and at the time all I had was a “Maybe I wanna join”. The members I’ve spoken with all speak highly of the guild to. It ticks the low combat box very much.
(I might be stalking this guild a tiny bit while I plan my own character)
https://us.forums.blizzard.com/en/wow/t/h-rp-firebrand-enterprises-hiring-for-2021/808907/72