This can be said of any game, though. If you play long enough, you'll eventually obtain all of the best items and finish all the quests and achievements. You'll achieve maximum levels (in games with an experience cap) and have nothing new to do, until something new is released.
FT doesn't have a paid developer team for new content. We can only add new content when players create it and it has been thoroughly tested. In the meantime, we have to wait, or find something to fill the time.
In these moments, it is our bonds with in-game friends that convince us to stay. Without that, we would all drift away, like so many before...
Cotne, you must find your purpose in FT. Be it grind, war, build, or just hanging out. Without that, you'll fade out of the game. I cannot tell you what you should do. I barely know that for myself most of the time. Lol. All I can say is to think on it to decide what you like about the game, and focus on that. I'll see you around.