I fractured my calcaneus about 2 weeks ago and had a plate with 15 screws put in. Ive been looking into anything possible to increase the speed and quality of my injury and theres not much besides following the docs orders, no weight on it before you get the ok. Otherwise your just gonna fuck it up worse but thats been said before. In the 1-3 weeks after your surgery your body will automatically take calcium and other vital minerals from other bones, meaning your at an increased chance of another fracture. Dont fall being an idiot because you thought you could handle crutches instead of a wheelchair (like me) during this time. Currently Im just working on getting nutrition absolutely nailed, because there isnt much else you can do otherwise. (quit smoking tobacco if you havnt already, and limit marijuana use to vapes and edibles is what my surgeon said) Get a good calcium supplement, look for calcium citrate its more easily absorbed by the body. Combine that with a vitamin D and/or K to increase absorption of the calcium and you should be set. If you dont already take a multivitamin nows the time to start. Bone is roughly 50% protein by weight, so increase your protein intake by A LOT. Its hard to get enough through diet alone so find a good whey or vegetable based protein powder, I just throw it in smoothies. A body healing a fracture can need as much as three times as many calories, so dont hesitate to pig out on the right foods. DONT USE ANY NSAIDS SUCH AS ADVIL THEY SLOW BONE GROWTH!
Thats pretty much all I can think of right now, but the Doctor can be your best friend or worst enemy. Mine told me nothing but "stay off it for 3 months and dont smoke tobacco", so definitely do some heavy research on your injury.
Best of luck on healing, hope your up and around soon!