Why are there currently few old users who interact with the forum, are they rich and forgot about the topic? Or do they fear for their security and privacy? I think both reasons are correct and they are following Satoshi's path of disappearing to remain anonymous. It would be nice if one day Satoshi gave us a brief notice that everything is going well in his life, I think he would know how to do it without compromising his identity. I would also like to see posts from old school users expressing new ideas, new projects. In the end, you must continue advancing, innovating, and researching, for the future, not everything in this life is money, there are ideas that are worth more than a fortune... Let us remember that the idea of satoshi currently benefits millions of people. So get your ideas out of the drawer, and share them with the community, as the Bitcointalk team quotes:
“Because we are able to operate comfortably using advertising and fee revenue along with our BTC reserves, we no longer collect donations. If you want to help the forum, please make good posts, report rule-breaking posts, and invite friends.”
At the moment I have the mathematics behind ECC as a hobby, it is very interesting for me because sometimes I spend hours playing with numbers, I guess I'm not the only one. so if you have something interesting on your mind, don't hesitate to share it.