Your laptop has a 3rd generation i7 processor (i7-3xxx) while Windows 11 wants to see an 8th generation Core processor or better (i7-8xxx) to install. You might be able to shoehorn in the upgrade as there are numerous blogs and Youtube videos describing how to do this on older machines, but I have not tried this on systems of this vintage. I do know someone that claims to have Win11 Pro running on a Precision T5500, but I have not personally seen it or know if there is a reduced functionality. Good luck.  
I have a Precision M4700 but Windows and Dell are telling me this is not compatible with Windows 11.  Does anyone know why and how to make it compatible?  I've seen mentions that there could be a problem with the video card and secure boot but nothing definitive. 1T SSD 3rd Gen Intel Core i7-3740QM ( 2.7GHz, 6M cache) AMD FirePro M4000 Mobility Pro Graphics with 1GB GDDR5
Windows 11 Compaitability for M4700?