Great article. These are guidelines I usually follow and this helps explain it a bit better for me. I do have a question about the description. When you say “Put your link at the very top of the video”, are you talking about the link to the youtube video or link or your website? My co-worker likes to put in the youtube link that goes to the same video in the description. Does that help?

I am not even appearing in the SERP (Youtube) while searching for the title of the video. Another point is we have distributed the copyright of our video with other premium youtube channel and now they are appearing almost everywhere in the SERP (even when a user search for the title). They are also expending $90 on a daily basis to promote that video.
SIDENOTE. The endscreen needs to be baked into your video during the editing process. For our endscreen, both the subscribe circle and “next video” sections are blank. When you add end screen elements, it’ll fill those sections. The subscribe sphere should be 196 x 196 px and the video or playlist rectangle is 410px x 230px. Here’s a free template you can download.
One of my favorite ways to give content a boost is to run ads on Facebook targeting people with interests that are relevant to the content. It’s fairly low cost since you are offering a free piece of content. By targeting people with relevant interests to your content, you drive the right people to the content and into the top of your funnel. And if your content resonates with them, they’ll share, link, and engage with the content in ways that will help Google see its value.