I think you'd best look for some guilds to find players to play with. Especially if you need people to do dungeons with.
But if this is the way you want to find people, tell them in which region you play (NA/EU) and on which platform (PC/PS4/Xbox1). For example, I can't help you if you aren't EU PC.
Only a few trading guilds. Though one I believe is more of an all-around guild. Something that starts with 'Ork'. I'm only in it for the trading part though. Not really involved with their chat.
I'll look it up when I get home, but it's always close to the maximum member limit.