I could help with this. It requires you to use your active private key to edit posts older than 7 days.
Give me a moment to get you some instructions
You can find me on https://steemit.chat or my Discord server https://discord.gg/fsJjr3Q
edit: seems like there are some issues that I wasn't aware of. I am going to keep looking into this. Will let you know if I find anything that can help