Rick and Cargo just gave you excellent advice.

IMO you have been singed off for the written - take it now, it is good for 2 years and it is not a certificate or rating.

I am assuming that you DO NOT have a medical or student pilot certificate. Make sure you pin down the date when your conviction was final and DO NOT apply for a medical/student certificate until after one year + 1 day. Look up FAA Form 8500-8 Question 18 v/w.

As above, join AOPA - pay and use the legal rep.

Your age at the time (18) is to your benefit. After you have your medical, every time the subject comes up do what you are doing right now. Own it and tell your story about how stupid you were and how much you learned. You are going to be ok. NO more trouble - this is imperative! Use Uber.

Good Luck.