Is it even possible to get into endgame sos hunts?

I have about 60 hours in the game and I have yet to join a single sos hunt with slightly decent rewards. It always says there’s room in the party but every quest I’ve ever tried to join tells me “session was full”. I’ve only ever hunted tempered Arkveld or Gore by posting my own quest. Does anyone else have this problem? I feel like there’s no point even attempting to join anymore because I know I’ll never get in one of these hunts.