I'll confirm what the other posts are saying;
Engagement, engagement, engagement!
I spent a lot of time in the summer trying to crack 150 subs by using twitter and following a ton of people, then messaging those who followed back, with a friendly "hey I'm a new YouTuber trying to grow my channel, it would be super awesome if you checked it out and maybe subscribed!" sort of message...
My videos spiked, likes spiked, comments were through the roof and I gained a lot of real subscribers...
Now, in my last few videos since the summer I haven't been doing that so much and my views, likes and comments have reflected that.... Also my subs haven't budged a bit.
nickdodd.ca | NickDoddTV | twitter | instagram | YouTube