Here are some small things, that are missing in my opinion:

• Save preferences like night mode and video player quality
• Improve the video player
• Registering takes too long, this might scare a lot of users away
• It would be nice to have an option to upload videos and schedule the release for the future.
• An import function from YouTube might lurr some users :D

But this is obvious. my main idea is:

• Due to the rewards you get for liking etc., people get attracted to begging, spam and other bad stuff. Manual report checking is probably impossible if the platform grows too much. A lot of people don't downvote, because it costs voting power (however, this prevents hate-downvotes).
  If catching new people, who like your videos, would be weighted higher, than fans' likes, this could maybe decrease the effects from bots and other stuff and, like the hate-downvote prevention, the always-upvote-people are not overestimated, which should give new content creators the chance to get value from quality, not from the biggest fan base.