Not like many other types of search ranking, no one definitive YouTube Search Ranking. Most people who use YouTube are either hopping from associated video to associated video, or they are searching personalised feeds. Those who truly do visit the homepage will see almost totally personalised recommendations. The ranking you could have is in their search.
Even YouTube’s keyword search is a little bit customized. It’ll give preferential spots to videos you’ve watched before, or videos from channels you’ve subscribed to, or movies from official sources. When none of these can be found, properly, that’s when optimization actually comes into play.
