You should try to migrate your X followers to nostr as imo the Nostr protocol is the future. Centralised platforms like X will die in the long term, imo. I do follow you on X but rarely view your X posts. I am subscribed to your substack account as you probable realise as I repost many of those articles on nostr (note, I rarely post things on X, just use X to “see” articles from many different people I follow on X)

As for how to tap into the “supposedly” hundreds of thousands of existing Nostr users I am not convinced there are hundreds of thousands of “active” Nostr users, otherwise I have no suggestions to offer, sorry.

Good luck. 🙏