Judging by my skill level (none) and types of bikes I am looking at, id be in the amateur Junior Open class (251cc +).
I was once an endurance athelete so I think I can get back to be where I need. I see there is a race at snowshoe wva, that has to be goddamn ridiculous and grueling. Some of the crazier skiing I've ever done, and in the summer it transitions to a downhill mtb park with some wheel and frame taco'ing hits.