how do you write seo content?

Write what only you can write. A worked example from your own work, a screenshot of the actual thing, a mistake you made. That's the bit the ten other pages on the topic don't have.

The mistake is writing the article you wanted to write and fitting the keyword in afterwards. Start from what someone typing that phrase actually wants - if every result on page one is a comparison table, a two thousand word history piece isn't going to rank however well it reads. Answer the question in the opening paragraph, let your headings mirror the sub-questions people are already asking, and stop when you've covered it. Length isn't what's being rewarded, completeness is.