So it has been what seems like a century ago for me when I was in a walking boot but just getting around and doing every thing with a boot wore me out!
So I would definitely ask you to be sure you are doing what you can to recover.
Nowadays, whenever something is injured I try to see if there is anything I can focus on that I normally don't focus on.
So, in your case, I would look into seeing what upper body isolation work I could accomplish seated as well as mobility for my upper body. Also, love the suggestion of core work.
So here's a few examples that you should only do if you're able to without taxing yourself or causing discomfort :
neck mobility
https://www.collagevideo.com/blogs/fit-forever-with-kathy/48741892-peel-years-off-your-neck
Neck mobility necks stretches
Z health
Strengthening rotator cuff exercises
Towel swings are great for cardio
Here's a whole playlist for no impact/hurt foot workouts as well
https://youtube.com/playlist?list=PLDh6UAgf3aBFUpny8uYKD6Fn9yldACXHL
But I post all this with the caveat of making sure you're giving your body PLENTY of time to recuperate..ok?
Best wishes for complete recovery!