Should i go for this keyword? Need your advice

Hi all,
Actually i'm still a newbie in the SEO and i started by searching for a good keywords to start a nich website. After doing searches over and over i found this keyword.
It containes 10 words.
Almost 12000 monthly searches.
It's a "buy keyword" that can be monetized perfectly.
Top 4 results are youtube videos as you can see. Only two of them have the exact same keyword.
I thought about building a landing page on that keyword or create a youtube video. I need your advice about it….

Should i go for this keyword? Need your advice