I don't think there are dead channels but being consistent is a key to having a successful YT channel, especially in terms of SEO. I actually do study data science (even though I have a gaming channel) and one thing that I have realized is that search engine takes more into consideration things like how often do you post, when do you post, the content of the description, tags, title and believe it of now thumbnail content. Based on all of that, it parses those into an algorithm that's going to give it a score. Now based on what people search and the type of channel they are watching you might or might not get recommended.
Of course the higher the views are, the more likely you are to get recommended, that's why it is important to keep posting often so you're reach increases. Additionnally make sure that your description, title and tags are as descriptive as they can be. YT will undestand what your video is all about and will be able to show it to the appropriate audience.