First: take a newspaper, knead it into a ball, dip it in some water, and stuff it in the front and heel of shoes for one night.
Second: support the shoes with a shoe wedge, mainly the first half, and push the shoe wedge forward as far as possible to support the first half.
The newly bought shoes will pinch your feet to varying degrees, so I suggest that you don't wear them for too long when you wear them for the first time, wear them more often, and wear them for less time each time, so you won't rub your feet in a few days.