If you don't respond in time, your license will automatically be downgraded. It is recommended that your information be submitted 20 days or more before the date to the Medical Certification Unit to allow for processing time.
Once the license is downgraded there are steps that need to be taken to reinstate past privileges
My lawyer says that I will win my contestation and won't need to take the steps to have my license put back to normal.
Do you have a Commercial Learner Permit?
I don't know what that is, please explain.
If you have a Commercial Learner Permit you will need to retake previous tests that you passed.
By the way, do you know about  Enhanced or REAL ID? Can I get a replacement license at a DMV office and get an Enhanced or REAL ID?
You are not obliged to get an Enhanced or REAL ID but starting in October 2020, if you have a Standard license, you will not be allowed board a domestic flight unless you have your passport
What if I recently caused an accident? And if I do not respond to the notice of noncompliance and license downgrade?
Your driver's license might be suspended depending on the circumstances.
Do you also know about this DMV Electronic Reminders program, can you tell me where to go to sign up?