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. You can then add labels to ad groups if desired.

Note: The option to SKAG is only available if the adgroup has at least one active RSA.

As stated in the editing steps, we don't recommend adding negative keywords through SKAG. You can read more details in this article.