Hi Bhaali, I read your post with interest 
Iām the GL and Recruitment Officer of Civitas Guild (US Nordrassil). Unsure if you are only looking for a horde side guild. If you consider Alliance, we are a guild which has helped many new and returning players learn ropes of raiding and Mythics +. Through our teaching, their confidence and ability grew and within 1-2 seasons, many obtained those associated with those 2 activities. So if you want to learn with us, alliance side, come check us out.
We are very casual in that we will bring along anyone to raids/M+ and folks are mostly 30s and up but with a civil and kind mindset. If this interests you, here we are Thanks and hope whichever you choose, you will be very happy 
Looking forward to chatting with you.
Contact me if you like: Elvwyr (US Nordrassil)
Discord: Elv#1390