One minor problem I would like to get fixed with SEO

Hello,

I don’t understand the following “• You’ve used this focus keyword once before. It’s probably a good idea to read about why you should not use your focus keyword more than once.” I read the explanation but still don’t get it.

Focus keyword is Minneapolis violin lessons.

Attached is the text of the page. I know the font is a bit big but I thought this would make it easier 🙂

Thank you.