Ni reklamu! Ba Ba Dum
I've just found in another post an interesting webpage called https://babadum.com , which is pretty amazing and helps you to learn vocabulary of a lot of languages, but not Esperanto yet. It seems very simple and also seems to need just one translation for a language in order to let it be able for any other language, so let's ask them to add Esperanto"
I am writing to an e-mail address which I found here. If you couldn't contribute, please ask them to add Esperanto, and if you can contribute, ask them to let you translate the course! (please ;))
This is an awesome site. You might want to recommend to Amuzulo that he contact them. He is the creator of the Duolingo course and sort of a celebrity of late. If he and his team throw their weight at them they are probably more likely to take Esperanto seriously. Also he has a vast network of people who would likely volunteer.