Just out of curiosity, any chance you may also want to play as DPS?
Our guild is a Casual Heroic progression, currently 6/8H.
We are actually in need of classes that can flex between tank, dps, and heals. I am not sure how “eager” you are to stick to tanking so that’s why I asked 
We are a group of adults (most of us r 25+), most of us have jobs, kids etc who still love to play WoW and raid together. We r all a close family and would love to add more to our group.
If you are interested, you can check us out here: https://us.forums.blizzard.com/en/wow/t/twisted-reflection-guild-recruitment