I peak my head in here and there to take a look around. Left in February. I joined LoTC in 2012 on my first account, left almost two months ago to prioritize the gym & my other hobbies that I find more preferential. I don't find this sad. The way I see it, if I cared about LoTC as a game more so than a community and loved text-based role-playing, I would have kept on going. But there's a point really where you round the corner and you've done all that interests you.
Creativity is not something that goes away. If you cannot muster it, it is not due to your age, it is because you aren't fulfilled. There was no "correct time" to get into this server, this is your make it or break it moment, and the inspiration will come with time. Especially once you invest time into the server.
For me, my creative work was always bolstered by my thoughts. Especially when I'm out walking in nature or traveling by foot to my favorite café or to a bar to kick it with my friends. I think quite a bit while I'm out and use my experiences to inform my writings. I attend numerous clubs at my University that foster a love of learning, which in turn lends me the ingenuity to write things I deeply care about. I now write for myself and not others, and my interest in role-playing has been confined to Baldur's Gate 3. For me, I love that, but even before that was the case my writing ended up being heavily inspired by tangible feelings I've truly experienced. Loss, compassion, horror, and the other complexities of our everyday world that can inspire us or seize things away from us in the blink of an eye.
Out along the worn pavement of your city block resides stories of every caliber. Tragedies, comedies, inspirational tales, and most of all the words and actions of people just like you that will inform you not only on the world that you live in, but also your perception of people from your own unique vantage point. The greatest instructor any of us has is life. Most of all, a life well-lived.
So, maybe you don't wanna quit LoTC; but go kick it on the pavement and find something new. Learn a martial art, play some guitar, read up on mycology, do resistance training or running, maybe even some swimming - a life well-lived, in my opinion, informs the greatest writing. Don't limit yourself to one thing, you can do many things, and you can inspire yourself by cultivating your own experiences and fostering creativity by doing, rather than being inspired in totality by the works of others, the so called "Greats" who have come and gone in real life and in fiction.
There is no better time than the present.