you need to do seo first so you can get ranking ..do keyword research more and place on tags option

I would like to know the strategy as well how to rank youtube videos.

Ranking youtube videos is not that easy and require some detailed knowledge.

I would highly advice you to check out this video right here:

How To Rank YouTube Videos - YouTube Video Ranking 2016 - YouTube

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To begin with, you have to make your YouTube video is SEO friendly by identifying which topic you are going to talk about. Also, you need to target to your own niche SEO keyword you want to put in your YouTube Video Title, then SEO your YouTube description and the relevance links added in YouTube description.