1. Thank your viewers at the end of videos, it's just generally nice to feel appreciated, they took time out of their day to watch your video, the least you could do is thank them.
2. Don't forget to interact with them in the comments section as well, if they commented something.
3. Make good content;
It might help if you find a bigger channel (Or more than one) to aspire to.
So that you may draw inspiration from them to improve your content, and it could become as good as theirs is, or even better
Watch their videos, study what you like/ don't like about them, and question why you like/ don't like that stuff.
Then try to implement that stuff into your videos, but in your style.
I'm not saying "go copy another channel" I just mean, use them as a 'role model' because it could help motivate you to seek new ways to grow as a content creator/ experiment/ try new things.
Hmm... I'm out of ideas xp that's all I got, sorry.