A lot of trad published authors do have Youtube channels with large followings. Having a large following will make a large publisher more likely to publish you. If you wanted to do Youtube, you could create videos that were voice only and used slides, Tv show shots and images, and never showed your face.
But you could also develop a large following by writing fanfic, or being a star at social media or blogging. Most trad publishers will do very little to promote your book unless they consider you an A-tier, so you will have to promote yourself. Developing a following first assures them you can do that.
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