Use remark magnets: debatable-however-respectful questions, both/or possibilities, “rate this” activates
https://damienqbav205.iamarrows.com/7-proven-ways-to-get-more-x-comments-growth-hacks-and-the-best-twitter-comments-service-picks
Use comment magnets: debatable-yet-respectful questions, both/or choices, “cost this” prompts, and micro-case reports. Make it user-friendly to reply in one line, yet significant sufficient to debate.