Use specific keywords
Choose 1-2 keywords that accurately describe your content to maximize search traffic to your video. Include them in your video’s description and title to increase its chances of ranking in potential viewers’ search results.

The same goes for your channel description. YouTube’s algorithm places a lot of importance on the keywords in your About page. Use them wisely.
Not sure what keywords to use? Tools like Google Ads Keyword Planner and Google Trends can help you get started.
Simply type in the words that best describe what your channel or video is about and Google will suggest the closest related keywords.

2. Repeat your keywords
Repetition lets YouTube know a particular term is relevant to your video or channel. Use your keyword two to three times for best results. Anymore than three, and it may get flagged as keyword stuffing.

3. Find complementary keywords
Include related keywords in your descriptions.