To be fair that's a very hard problem.

I have no formal teaching experience, but I taught several competitive mathematics seminars for elite high school students. Transposing the classroom model is unsatisfactory, working remotely strongly encourages you to pursue asynchronous models. But on the other hand a lesson is more than just a youtube video, you definitely want some degree of interactivity.

It sounds really silly, but I wonder if internet-first models like Twitch streams with rich interactive chats are actually closer to the solution.