On primal you can release your lectures as blog posts or just post on here as a long from note. no limits on nostr which is great.

you will probably get better engagement when you write about bitcoin but also your ones on central banking etc will probably do quite well. I would just start releasing them over time and see how it goes.

seeing as you have already done the work you might get a second wind of value from putting them out there.

also, what really gets the community going is when you send value back. On twitter you can like or share and that is about it. on nostr you can send money for something you like. this can be as low as 1sat but the sentiment is there. I find the more sats I give, the more I receive and also its fun.