Hello and welcome back
Right now not that many PvP factions left. Only UV and Riot Team/Desert Wanderers and many remnants of other factions playing with Riot Team.
UV will literally take anyone, they also have a bad reputation among other factions that were here so I suggest not joining them. Don't bother joining Khans since they just kill bluesuits for "top PvP"
I'd wait for wipe if I were you, should happen late December. No point playing right now.