I already looked it up and did a post on it. Are you asking fully dedicated special teams coach? Or just a full time position coach with the special teams title? As opposed to just an analyst like we had?
The teams we are chasing in our division such as Northwestern, Wisconsin, and Iowa all have full-time special teams coordinators with no other responsibilities (do not coach a position).
The teams we are chasing in the CFP like Ohio State, Alabama, and Clemson all have a position coach like the TEs coach responsible for special teams coordinator.
I just read 57 out of 65 P5 teams (Notre Dame included) have a full-time special teams coach, but unsure how true those numbers are. We would be 1 of the 8 teams that didn't in the entire country. We also are the only team in the B1G that does not have one if I remember correctly.
The blueprint is out there. You need a full-time guy doing it. We were so bad in 2020 i'm shocked we are still trying to do it the same way. But the good news is there quite literally is nowhere to go but up so it will "work better" in 2021.