Keep stretching the ankle etc.
7 months post op after breaking my tib & fib, my ankle is the main thing holding me back, even though I had the titanium rod driven into an already bad knee.
I'm still probably 8-10" short of taking a "normal" stride. I'm probably gaining about1/2" more per week.
I did start riding a bit, 4 months post op, although I couldn't walk with out some means of support.
I had to use the bike as my "walker" to get to the street and use the curb to mount/dismount.
I have a hunch the Dr. might not have been real pleased if he knew.
The main problem with my ankle is side to side movement, like walking on uneven ground, turning etc.
I am 65, so your "youth" should help.

BTW, my avatar is the first time without my "boot" and was taken about an hour before my first 2 block "ride".