Yeah, eventually I found out that it was because of the lucky moment thing and had to wait for 3 days to play again.
Then I created another character and... arrived at Frozen Frontier at level 21... *sigh*
What I said about the coins was just an example, because since there is no boutique in this server, the cosmetic items are only available through npcs in which you pay with those special coins. But the thing really is about how boring the game gets when you're on a level that's higher than the area. And I don't like to skip missions, part of the reason I play any game is the story, reading the mission texts, getting immersed, that kind of stuff. I do want to get to the endgame at some point, but I play the game to have fun the whole time, not after 400+ hours into it...
But anyways, I'll keep trying, maybe I'll create another one and try doing less missions.(My current ingame name is Sall)