RVN slipping in “What to Mine” as one of the most profitable coins to mine, but why?

Been watching RVN for about a year now, I always really felt this was a coin that would really pop off. It was well positioned as one of the most profitable coins to mine next to ETH so when the merge talks came about, I thought it would be good news, but for the last years RVN has been the the 1st or 2nd most profitable coin to mine, lately its slipping down to 4th or 5th place behind ETC, FIL, and NEOX… what gives?