Not a dedicated m+ community, but we still run alot of m+ in a chill manner. U are welcome to join us 
There’s also the calmer keystones.
https://eu.forums.blizzard.com/en/wow/t/alliance-scared-of-dungeons-eu-en/10306?u=sinaaki-doomhammer
https://eu.forums.blizzard.com/en/wow/t/a-mythics-calm-keystones/33362?u=sinaaki-doomhammer