I don't have a channel, but I guess the only strategy is to just start putting out videos. If you have unique ideas, I'm sure you'll get a following quickly. Try finding a niche - like there are thousands of beauty you tubers, etc. Try finding an area that not a lot of people are making videos on, and you'll succeed.
Just start producing some videos, and hope that people will like them
I think it might also help to simultaneously create an Instagram account for your youtube channel persona (if you don't want to use your own insta), and start getting a following on there.