All realms atm are med to low and forums begging for more connections and merges or free char moves because the game is dead so no idea what lucky realm you are on.
Puny has linked the top ones repeatedly that do keys from 2- 20 24/7 and nice and calm and fun at same time they are out there you just need to look.
What Do I Do? - Community / General Discussion - World of Warcraft Forums (blizzard.com)
There all those do high keys and in a none toxic way.