How to prioritize gap keywords
Sort the gap list by search volume × ease of ranking. The sweet spot is keywords with 500-5,000 monthly searches and difficulty under 40. High enough volume to matter, low enough difficulty for a small site to actually win.
Then check the current top 3 results. If they're all from giant sites (Forbes, Wikipedia, big brands), it'll be hard. If you see other small businesses, blogs, and niche sites, you have a real shot.