Hey there!
I have a friend that runs a M+ only guild on Area 52 known as Mythic After Dark. Their main goal is get as many people to 3k IO and eventually attempt to compete in future MDI’s.
For reference this is his guild main Joeret - Area 52.
They’re a chill group to run with. Their Discord is very active, and they tend to run M+ late into the night. Drama free also! One of their guild perks are all repairs are taken care of by the guild. I think they are currently attempting +17.
If you’re interested, here’s his Discord Tag: sgt1115