There are so many people today that are competing and want the very same thing you want: Subscribers, views, likes, etc. So the goal is to be different. Don't just want subscribers, view, likes, etc - Want to have a genuine connection with your audience. Be helpful. Be active. Be everywhere! Market in everything you do, but in a way that is relevant to them and provides value. I haven't been investing a cent into my channel. I've just been paying attention to my audience, things they want, what's trending/viral, take advantage of things like holidays to do occasion oriented events. It's not just about content. It's also about connections, being different, and being at the right place at the right time. The only way to increase that possibility is to be in many places, so your chance of being in the right place and then at the right time is increased. I completely agree with others here: Grow naturally. So many people are spending money to promote it isn't worth it. Plus paying for exposure doesn't necessarily give you an audience. People need to connect with you and only you can facilitate that connection. So, go for it! Don't forget to help others out along the way in your niche and in your audience, too. Be open to criticism. Improving can only help your chances. It begins with you. If they love you enough, then you won't have to bring people to you because people will gravitate towards you. Good luck!