I’d poke at keywords.
Basically, create a YouTube video, medium article, etc. that is optimized for that keyword. Monitor the SERPs for results.
Anything that shows up in the first 10 is medium. Anything that shows up in the first 5 pages is easy. Anything that hits page 2 or above is SUPER easy.
You can prioritize the medium keywords by sending 10 crappy PBN links to each of those pages. Anything that hits page 1 is significantly easier than the others.
Other than that, go after the highest traffic keywords and monitor GSC data for additional opportunities.