If your Heroic performance doesn’t match what guides suggest, would you reroll immediately or spend some time reviewing your logs first?

I had the same issue on Frost where my applications for higher keys would just sit there with no response. After spending too many evenings waiting in Group Finder, I tried a wow mythic+ boost to work on my score instead. After that I seemed to get into groups a bit more often, though obviously there are plenty of factors behind invites.