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Facebook can tell from the cookies saved on your device what other sites you visit. Anything with a facebook logo will cause your browser to retrieve data from facebook's server and place a cookie on your machine indicating that you visited there. They can also used techniques such as browser fingerprinting to realize that the browser you are using on this account is identical the browser on a different account you might try to establish.
Actions for you.
→ Read about cookies
→ read about browser fingerprinting
→ read about single-pixel ads
Consider if you want to establish your new account with an entirely different device that has never visited your current facebook account.
Consider if you want to delete all the cookies on your device.
Consider what steps you can take to appear as a completely different user.
You need to learn more about how users are IDd on the internet. I do not have the time or patience to provide a tutorial but from the hints given above, if you search, read and study, you will be able to learn a great deal.
That's it. Carpal tunnel, can't type anymore.