Oh boy. Some jerk on the subway stepped on your toe, and now you have a permanent wrinkle in the toe box crushing your toes!
Sadly, this is the hardest shoe injury to cure because once the toe box has been crushed there isn’t any way to restore it. The best we can suggest is to find a thin, sturdy and flexible piece of cardboard or plastic that you can slip between your socks and the toe box. This will act as a temporary substitute toe box and prevent the wrinkled toe box from crushing your toes. Most likely, you will have to replace this once in a while.
You can also try to tightly stuff the boot with paper towels or newspaper. Spray the toe box with some shoe-stretch spray to help keep the shape and let it sit for a few days this way with the newspaper tightly compacted in the toe box.
You can also try putting a small gel pad on the roof of your boot where the dent is. Good luck!