This Steemit writer had a really good article talking about repurposing old blog content. I recommend it.

https://steemit.com/steemhelp/@nanzo-scoop/advice-for-migrating-bloggers-on-posting-existing-content-onto-steemit

I have decided to start migrating my old blog content to Steemit, because it just makes practical sense to me. Steemit is better. Just make sure the content is relevant and not outdated material. :)