Ahrefs service is a paid service that allows you to:

1. Perform external link analysis of competitor sites. 2. Find competitor sites based on search results. 3. Search for keywords. 4. Search for keywords based on competitor sites. 5. View the visibility history of competitor sites. In addition, Ahrefs offers its own rating (DR Domain Rating) of a site's level based on the number and quality of external links, which allows you to roughly compare sites with each other and roughly understand the quality of the site.

You will also be able to estimate how difficult it is to promote a particular keyword.