To improve the line of your arch and provide better weight distribution, three-quarter or even half-shank your shoes (practice on an old pair first).

Then, stitch one long ribbon in a U-shaped pattern (secure under the drawstring casing on one side, continue under the arch and up the other side).  That helps pull the shoe towards your arch so that it’s more flattering.”
Source: Mary Carpenter for Pointe Magazine

improve arch support in pointe shoes