This is one of the primary issues you face when playing a game that is not available in the language you speak, in addition to having extra criteria to play (the VPN). It results in a very small population, and many of the players cannot play as frequently as you would like.
I've noticed that you're on almost all the time. Unfortunately, many of us cannot do that. For example, I myself often only have time to do my daily quests, before I need to go to bed for work the next day. I'm sure many people have the same or similar circumstances, I know it's the same, if not worse sometimes, for Phanir.
Then add in the situation that others here have mentioned. The game contains a lot of grinding, as Dragon Quest games typically do, and as a result no one really ever feels powerful enough to do things with others unless they're capped themselves. I can't count how many encounters that I've been in that I couldn't possibly win without my Lv.80 mercenaries, and unfortunately fighting high level monsters is by far the best way to grind. So most people don't grind without a party chock full of Lv.80's.
The only thing I can suggest is to try and influence people you know outside of the game to bite the bullet and try the game. Without more people in the community this will always be an issue and there's really nothing you can do about it.
We can attempt to set up some activities, but really, those would be few and far between.
We can hope that the work Aeana is doing will help more people from the Den join. I know Woodus said in that thread that it would influence him into buying the game, and I wouldn't be surprised if others would be on board as well. The language barrier is probably the most influencing reason more people don't play.