Good content, I moderate a Mathematics community if you'd be interested in posting to it.
https://hive.blog/trending/hive-122481
I also subbed to your youtube, I am trying to start up a maths youtube myself, focusing on secondary level material. Looking to cover the course and also do exam solutions. Check it out I'd love some feedback.
Good stuff! I had a gander at some of your videos and just wanted to advise you to add more descriptive information in the title/description regarding each question/video. This way helps the YouTube/Google search SEO and recommendations to show up! Besides, looks good!