You can improve the performance of low quality score keywords by adding them to their own single keyword ad group (SKAG), directly from the Quality Score Tracker tool
To get started, head over to the Keywords tab, where you'll see the top spending keywords in the account with their own individual metrics. Information such as Quality Score variation, ad relevance, impressions, and cost can help you determine which keyword(s) would benefit from being added to their own single keyword ad group.
When you press on the SKAG icon shown above, you'll be prompted to review and edit the ads for the new ad group.
Note: As stated on the editing steps, we don't recommend adding negative keywords through SKAG. You can read more details in this article.