The advice we followed a few years ago when my son was torn between two options was to have two days, one devoted to each school, the week before commit date.
On Day 1, he woke up and put on that school’s shirt, and tried to act and feel like he was going there. I put little signs around the house with pictures of the mascot as well as exciting facts, rankings, other things to get excited about going there. I had a banner and put up any other stickers, signs, pictures or other things we’d gotten. I made pancakes in the shape of the college initials, and whatever other things I could to make him feel like he’d made his decision. The next day I did the same for the other school.
He said one of those just felt right, and the other felt wrong, and he knew he had his decision.