I filed my I-751 today. I used the divorce waiver since we got divorce due to abusive relationship.
I will say that I payed the fees that are posted on the website ($595 + Fingerprint), I hope it is okay.
I also attached: the form itself, a cover letter (9 page long), joint health insurance, our lease contract together, joint car insurance, joint bank account, a statement from a psychologist I saw, one affidavit of support, some receipts and 15 photos of us with family.
I hope I did not mess up the fees since I did not know they were going to increase.
And I hope I get a response soon, My GC expires on December 2020.