Ah MXM.... You have worn the life out of your beloved DryJoys. I would venture a guess that repairs would financially cost more than a new pair of DryJoys. And while you may love your shoes, the new designs are quite wonderful. The shoe technology has really increased and the materials so much better.
I might also suggest, based on the wear you describe, that you invest in two pairs of shoes and rotate them. This will decrease wear and increase the life of your beloved footwear even more. Many here alternate their FJ's and increase the longevity of the shoes significantly.
Good luck sir!