Most of my growth comes from my most popular videos man,
Honestly it all comes down to figuring out how to get searched and noticed, you need to title your videos something people will search for or nobody new will find it.
Make sure you fill out your tags with keywords people will actually be searching, and also don't always do videos that are super popular, you need to find something that is searchable but not over saturated.
For example my most popular "series" is a game called swords and sandals, now they aren't my most popular videos, my most popular videos are one off videos, but the series as a whole did really well compared to others.
Why? Because I used titles people would search for, I used thumbnails that matched the title well and stood out from other similar videos, and finally it comes down to a little luck.
The developer of the SaS games actually noticed my videos and tweeted them out every time I uploaded one, he even follows me on twitter now.
I got a lot of support from the swords and sandals games and when I stopped playing after the third installment of Swords and Sandals, I actually had comments saying hey when is the next SaS video?
And that is the most basic step, make content that people want more of, it does no good to get exposure if you cant get people to stick around!
Take it all with a grain of salt though, obviously I don't have a huge channel, I don't even always follow that advice I just gave you, I've made over 1000 videos and only 10 of them have over 1,000 views and only 3 have over 10,000 views
However out of the top 20 or 30 videos on my channel 80% of them were on purpose, the other 20% were the dumb luck ones that I looked at and went ok, why did these get views? figured out the answer and then used that knowledge in the future.
And my most popular video with over 30,000 views? I did that video as a test for myself, specifically to see if I could make a video that would get more views based on my knowledge of how youtube works, and it worked. It became my most popular video.
One final note, if you look at my most popular videos, they are all older videos most of them being 1-3 years old and very few of them, actually only one that i can think of got a ton of views over night after I uploaded it. Unless you upload a video that goes viral, the views take a lot of time to get there.
Best advice I can give you? Stop worrying about it and just make content that you enjoy making, and remember if you can't watch your own videos, don't expect others to.
I've been doing this for a long time, and I've learned a lot from it, but again take it all with a grain of salt, if I was that good at it, I'd be a full time youtuber XD