Unlink Old Facebook from Instagram

I need help with unlinking an old Facebook page from my Instagram business account. I no longer have access to that Facebook account, and despite trying several troubleshooting steps, it's still connected.

Steps tried:
- Resetting Instagram account settings
- Contacting Instagram support
- Unlinking through Instagram app

Ideal Skills & Experience:
- Experience with Instagram and Facebook integration
- Familiarity with account recovery options
- Strong problem-solving skills
- Prior success in similar unlinking tasks

Please provide a detailed approach in your bid to resolve this issue.

You must be able to work without giving you my password
Kindly see before for the error I get when I try connecting my new page