Another thing you could do is start to advertise on Reddit and other social media. Just find a subreddit that is in your niche, for me that is r/vlog and other subreddits related to that. Just make sure to read the rules before posting and also try to actually engage in the community and give other people feedback, not just self promote. Also, setting up a Twitter is very beneficial. Just follow channels and people who might be interested in your content, and engage with them and try to build a relationship. Never, ever, so sub for sub or even tell people to subscribe. Just let it happen on its own, it will. Good luck!