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I have been following advice for improving the SEO of my YouTube videos, for instance by having the keyword early in the title and description. Do I then need a plugin like Yoast Video SEO for my website where the videos are embedded to increase the chance of showing the videos for that keyword?

I wonder if there is anything I can do to increase the chance that Google shows stars that indicate the average score of our reviews from Facebook or Google MyBusiness for the keywords where we rank nr. 1, for instance our brand name?