Raider.io has recruitment settings that i think will show up ingame and on their website.
I think you can set yourself to looking for guild and other with it can see it and guilds can post they need memebers and itll show their progression so you know how active they are.
We use the in game guild finder to conveniently invite each others’ alts when we aren’t online at the same time, I think it says something along the lines of “We are not recruiting and we do not exist” please don’t worry it is not personal at all.
I just asked in the trade chat and got lucky lol. I found an “alt guild” but people are always making new characters and wanting to do stuff. It’s nice.
The guild finder tool has been a worthless piece of crap from the day it was invented, and everyone told them that. But it’s Blizzard, they know better than everyone else, right?