This is mainly about your Youtube followers, although principles work in the same for other social networks and most of the video sharing or streaming services. Curating and distributing content takes time, but getting and keeping attentions is even more difficult. Sometimes is not only complicate but also costly, therefore having a method to this helps a lot.
You already know this but, include accurate and relevant keywords in your video’s title, description and tags if you want your video to be indexed and found. Take advantage of social media and share as much as you can without spamming. Nobody wants that and you’ll find the right balance.
Post comments on other videos that you find interesting, this helps engagement and you will be easier to be found online if you take your time and match the quality of your content with quality comments. And, one last advice, go live if you have the technical means, and carefully organize your content. In this way, visitors will come and stay on your channel, and if you decide to monetize you’ll also make some money.