High traffic on irrelevant pages

Hi, I'm quite new to SEO, trying to help with my dads internet shop, I have completed Analytics Academy Courses both Analytics for Beginners and Advanced Google Analytics. However I still struggle on how to use the information I have learned.

For example, when I go to Google Analytics, in Acquisition - Search Console - Landing pages, first 2 pages with highest impressions lead to products that are not main product that we're trying to sell, actually the opposite, just a accessory, that is not so important to the business that much.

If I Understand correctly, keywords that lead to these pages have high average position for google, that's why there's such high traffic?

What can I do about this? What can I take away from this, how can I use this to improve performance of the entire website?

or any advices on what courses I should take, where can I learn more on how to use this kind of information?

Any advices will be appreciated :)