Hello! The desire to subscribe is influenced not only by the content of the videos, but also by the design. A beautiful, well-designed channel inspires confidence and the feeling that the author is serious about the matter. You need to learn how to correctly compose headings and descriptions, select tags and hashtags, analyze statistics in order to understand where the viewers came from and for what requests. If some topics bring in the most viewers, then you need to use them and shoot more videos on this topic. If you have other resources where there is already an audience, then you can advertise your page there.