what's the practical way to increase engagement on facebook?

Native video rather than YouTube links, and questions people can answer in one word. Sounds cheap, but 'which one, A or B?' with two photos gets more comments than anything clever I've written.

Post less and reply more. The single biggest change I've seen is someone sitting on the post for the first hour and answering every comment properly rather than leaving it and coming back the next day. After that: stop posting bare links with no context, ask something people can answer in one line, and upload video natively instead of pointing off somewhere. None of that is clever, it's just the bit most pages skip because it takes time.