SEO tools write for us: what makes an SEO tool guest post worth publishing
Specificity. A reader does not need another description of what a keyword tool is. They need to see one tool handle one job on one site, with the parts that did not work left in.
Tool data is an estimate, and good pieces treat it that way. Where you can, check a tool figure against Search Console and say how far apart they were.
About link pitches
A large share of the pitches this subject attracts are really about placing a link. One descriptive link to your own site is fine when it helps the reader.
A pitch whose real subject is the anchor text is declined, and a paid link is a sponsored placement with rel="sponsored", never an editorial one.