Nobody will be able to give you as good of a tip as a professional physical therapist could, which is what I would strongly recommend. I am lucky enough to be married to a PTA, and I understand they are expensive and sometimes don't understand the sport as well as you'd want them to, so my best tip would be to do the "heel walk."
Provided that this doesn't cause you additional pain or stress, the best exercise that I have done in rehab for the top of my foot is the heel walk. What you do is lift the balls of your feet off the ground (both legs) and just walk on your heels. I usually would do 5 reps of 50 steps each leg, 100 steps per set, 500 steps total. Take steps that are about 6 inches apart and walk in a straight line. If you have a carpeted area long enough this will really help strengthen the tendons and muscles around the top of your foot and ankle. Don't pick your feet up much either, just a nice soft slide across the carpet will do the trick. Also, wear socks to prevent carpet burn.
Hope that helps!