There is no single method to grow on YouTube...this entire section on our forum will be updated on how to properly grow your YouTube channel by using all the different methods out there.
You need to understand that YouTube is like a motor vehicle...you can't just put an engine in it and expect it to go, you need tires...you also need a steering wheel, a gearbox...you get the picture.
Growing on YouTube is exactly the same, we will be breaking down an entire series on how you can keep using the tools that YouTube offers to grow your channel properly.
Here is a video on how to use YouTube Tags and Hashtags to get more views.