You must not have played the end of an expansion before. End of Stormblood had a content drought just like the end of Heavensward and the end of A Realm Reborn and any other game that's winding down towards a new expansion where everyone has already completed what they wanted to complete of the available content. During this time, it is not advised to join the game unless you're trying to burn through MSQ to reach the end of SB in order to be prepped for ShB. For those of us who have been playing since an earlier patch that have finished everything, we're simply waiting. Many have already canceled subs until the launch of ShB. I have personally still been doing my weeklies so I can be capped on tomes and scrips for Early Access.

The servers still look well populated to me so it's likely you're not using the world visit system or are just on a small server. I wouldn't rely on the party finder right now for just about anything. Again. End of expansion pack. Won't be a lot of people doing anything worth while outside of farming old content for mounts, titles n' glams. Sorry it's empty for you, but it'll get better.