If you rebrand your channel art, thumbnails, and places where you record it is fine.

JUST don’t rebrand videos extremely quickly into something new that does not have anything to do what you are doing now. Not saying you should not change radically. You should change slowly into new content for your viewers to see if they like it. People will see potential in what you’re doing and check it out more. If not just change up things they don’t like. (That was a edit I made for other people who are viewing this)