Don’t get hung up on this score. It doesn’t matter. I know it’s counter-intuitive, but you simply can’t reach 10/10 for some keywords. If your campaign is performing well, then I would just continue to let it run like this. 8 is way above average.

If you’re absolutely determined to increase the score, then you’ll need to work on your landing page since the other two components are already at “above average”. Create a new page, set up an A/B test, see what Google’s algorithm thinks of it. Do keep in mind that you shouldn’t just optimize for the machine, but primarily for your customers.