While I find it admirable to promote the use of Esperanto I don't think that many people want to start learning another language. It might work to garner a nerdish interest from people who love languages - which will contribute to the number of competent speakers. But otherwise it's hard to convince people to learn a language you still can't really use in your daily life.

And at the moment I can only give you marketing ideas that will attract fringe groups: Bad Herzberg in Germany is the ❤️ of Esperanto - a great place for hiking. You can even consider it a kind of pilgrimage. William Shatner aka Captain James T. Kirk played in a film that exclusively uses Esperanto. He holds the rights to the film too. You can see snippets of this film in Blade Trinity (and they had to pay Shatner a pretty penny to use it) and there's also a short dialogue in Esperanto in this film...