Being from General Category, I believe with a Score of 500/720 in NEET, you have bleak chances in securing a seat in MBBS at any of the State or Government Medical Colleges. However, you must keep hope and apply for the Counselling Procedure.

To know more about NEET Cutoff of Medical Colleges in UP do follow the link below

https://medicine.careers360.com/articles/neet-cutoff-up/amp

I would suggest you to take a Drop, if possible, since there are high chances after a 500 in first try in end up with 600+ in the next attempt followed by Admission in some of the Top State or Government MBBS Colleges in Uttar Pradesh.

You may also consider Top Private Medical Institutes, if you have sufficient financial and monetary security. Private Medical Colleges of Maharashtra like DY Patil, Kalinga Institute of Medical Sciences, SUM in Odisha as well as those in Karnataka like KMC Manipal and other under COMEDK Medical Counselling like KIMS, Ramaiah and Bangalore Institute of Medical Sciences are all good medical colleges and provide effective medical education.