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They want evidence that you have shared a life, a residence, and finances since your marriage. Provide samplings of things covering dates going back to 2015/2016 or at least since your greencard date. Earliest joint bank statement, some in the middle years, and most recent. Old leases, new leases if applicable. All tax transcripts since together. Car insurance from dates covering some dates in 2016 and beyond. Get the picture? Build a 3 year sampling of evidence of commingling.

Sounds good. With that said, you should file I-407 — Record of Abandonment of Lawful Permanent Resident Status when you're finished with being a permanent resident, as this will allow you to inform USCIS that you are voluntarily abandoning your status, it'll keep you in their good books at the very least. If you're nearing the expiration of your green card, then don't worry about filing I-407, as it'll auto-abandon itself anyways.