A gap analysis returns eight hundred terms a competitor ranks for and you do not. That is a finding, not a plan, and the distance between the two is where most gap analyses die.
Filter before you plan
Remove their brand terms first — you are never ranking for those and they usually make up a substantial share. Then cut anything below a volume threshold worth writing for.
Group by intent, not by term
Eight hundred surviving terms are not eight hundred pages. Cluster them by what the searcher wants and the list collapses to perhaps forty topics, each justifying one genuinely useful page.
Sequence by winnability
Start where the gap is widest and the competition thinnest — topics where they rank with something mediocre. Beating a weak page on a real topic is faster than attacking their strongest asset, and the early wins fund the rest of the programme.
Try it: List Difference (Keyword Gap Finder) on SeoWolf's Notepad.