The server population is very high at the moment. You won't have any trouble finding groups in many areas. As of today, we can /who all LFG so it should be easier than ever for people to find you if your LFG tag is up. Sometimes you will have to put effort in to finding a group. The less mainstream zones can be some of the most fun to solo or group in. The insanely populated exp zones can be less rewarding as the camps are smaller, due to competition, and there is more competition to get in to that group you're eyeballing. The guides wiki has some useful info on this and much more!
https://wiki.project1999.com/Players:Adventure