#1 Void has its up and downs in populations, usually in connection on when a new event is released, and how many months it takes to get a new one. for example now, all the channels are busy due to the event. I assume it dies down once the event is over and the people have no reason to "hardcore grind" anymore.
#2 in queue for SDs? usually yes. queue for normal pve (like hamel); usually not. The best thing to do is to get into a guild, get to know the people and ask for their help, if you need any.
#3 Pvp community.... jeez, its shit. Back in 2017 you could still get SSS with a +8 SD gear/ spar gear; nowdays you usually HAVE to be geared to get anywhere in arena (purple elrianode, tanky IB set; right sockets etc etc). So if ur new and have no resources, i wouldnt recommend it, unless you play some broken pvp shit like EW (Laby)
#4 hard to catch up? not rlly. most people still use type-void rather than FoJ; cause only limited amounts of people do raid sucessfully (without having 2 FPS crashdowns) and have the money to mystic stones said FoJ weapon (flames of judgement; varnimyr raid weapon).
Type-Void is fairly easy to get nowadays, youll need to farm Add Dungeon anyway for the shards (yellow stage 5, red stage 5). Overall; it would be a good time to return rn, due to the summer event just being released, which gives you the oppurtunity to gear up (+10s and +9 scrolls for sea shells), if ur up for the grind. ~~~ and I think we'd be happy to get more people back owo/