Those are the ones I know about: Jerry Banfield explains a lot about online teaching : here is a youtube video

Keep in mind he was top seller on Udemy and got kicked off!
I think he is really aggressive in his online marketing experiments, the good thing is that he is really transparent about it and why he got kicked off (it's also on youtube)
From his description of Skillshare, it might be worth checking out for you! Given that you already have a relatively big following on youtube, the hard work has been done. You might need to simply offer something that people can buy. Maybe a cooking skills course, how to make a foodblog course, a Russian cooking course, save money and eat well with Russian cooking etc... I think people will pay for concrete information that allows them to achieve something in their life, solve a problem etc. Those ideas might be something you can try on Udemy, I guess you'd need to experiment a bit with different platforms anyway