You might already know about it, but I would recommend the Great Courses plus (now called Wondrium). They have a lot of courses that are introductory undergraduate level. Neil deGrasse Tyson has actually done a couple of courses for them. It is just videos though, so I am not sure if it is what you’re looking for. Some of the courses do have things to work on, like the introductory machine learning course uses Google Colab for people to practice running the code. But it isn’t interactive in the same way Brilliant is.
I guess I use different platforms for different subjects. For computer and business topics, my main recommendation would be the O’Reilly platform, I primarily use it for books, but there are videos, as well as an interactive coding thing. It is somewhat expensive though: $50/month or $500/year. They used to run sales, which brought the price down to $200/year or so, but I haven’t seen one for a while.
I have also been using DataCamp lately, in part because they had an offer of $180/year a few months ago. They focus on data science and related subjects. (I am currently doing a quantitative finance course through them.)
I have tried Brilliant.org, which was fine, but a lot of the coverage is relatively basic. Also, at the time I tried it, a lot of the courses were unfinished, so the material on several subjects only took an hour or two to go through.
There are also things like Coursera and EdX, but I imagine you already know about them.