Past 12, does meta really impact the runs?

Hii Everybody, I have a question but Im a Arms warrior 636 ilv and 2756 io https://raider.io/characters/us/area-52/Iconicdiva and when trying to queue to 12+ its starting to get hard, if not almost impossible, to be accepted into a group. I'm new to wow but when i was at my 10 and 11 it was kinda ok to find groups but now at 12 things started to get really different, even that i've already completed a 12 (COT). Its that normal or its because of my spec?