Seeing as how I am a YouTuber myself (around 1,400 subs now). Ill throw in some things too.
1. Using other copyright material is more lenient than it used to be. Nowadays if you are using a song, depending on the record label, they won't take down or mute your video. Instead, a link will be put below your video to show people where they can buy the song. And for certain purposes, you can disobey copyright laws under the
fair use policy. For me, this loosely includes the song covers that are my channels main feature.
I am not in good standing as far as using copyright material, but I have not been banned, my videos are still up, and I am in good standing with YouTube and it's rules. There for they leave me be.
2. Create a logo or an introduction image, as well as an outro. It familiarizes your subscription base with an image or segment that is uniquely associated to you.
3. Share your video, everywhere. Facebook, twitter, even these forums. If your video is good enough, people will share it themselves without help.
4. Do a collaboration with someone with many more subscribers than you. Basically, get involved in a video that will be released on their channel. It won't bring their entire fanbase, but a few stragglers might find themselves interested in your channel.
5. Video response on popular videos that relate to your content.
6. Tags are now invisible and hidden. Nobody can see them and they are strictly related to search terms. If you're desperate for views. Pull out the Merriam-Webster dictionary and get to tagging haha.
7. YouTube unsubscribes inactive users. Yes, this means that when you looked at your sub count and it disappointingly went down, it doesn't necessarily mean someone didn't like your content enough to stay subbed. It could mean that someone didn't log into YouTube for a very long time.
8. At around 500 subscribers, through certain third party companies, you can become a YouTube partner.
9. You are free to monopolize any of your videos that do not contain copyright material. But your content has to be worth sitting through an ad for anyone to actually watch.
10. Unfortunately/fortunately, the more subscribers you have, the more YouTube likes you and will be lenient or turn the other cheek to certain violations, especially copyright.