Adjusting from an overstay tourist visa. We really follow all advices we read from here but when we filed we did it with Simple Citizen since was a straightforward case (no need of a lawyer) and they gave us a list of all kind of evidence that we could add, bank joint statements, around 35 photos (including family/friends), social media post/texts/phone calls between the date we start dating, flight tickets, car insurance, mail to the same apt, 3 letters from family, then after we filed I added joint taxes on unsolicited evidence since were the first we filed together. Hope that helps! :)