Hello dee1105,
Double check you have correctly identified your Mac model: Get more information about your computer choose Apple menu > 'About This Mac' in the upper left corner of any window, then "More Info..." or "System Report". Copy and paste the information here, but omit the serial number and UUIDs (if present). Please also include the year which may not be provided in this information. More about this in "About System Information [Profiler] on your Mac" - https://support.apple.com/HT203001
According to: macOS Big Sur is compatible with these computers - https://support.apple.com/HT211238
you need a Late 2013 MacBook Pro which is a MacBookPro11,1, or later.