You could argue Cam's last elite pass rushing year was in 2019. That year, he registered a pressure on 19.2% of attempts against true pass sets (essentially standard dropbacks). This year, it was 12.2%, and all of the elite edge rusher names are in the 20's. Also, for that stat Cam ranked 78th out of 99 edge rushers with at least 100 attempts.
He did have a solid year for sacks/hits in 2021, but there was some luck involved since typically about a third of those pressures turn into a sack or hit (he was at 50% that year). He was probably unlucky this year with only one out of six pressures turning into a sack/hit, but it could also be an indication of being a step behind at this point in his career.