hahahha! here we go.
First of all don't panic , You will 100% do stairs again, I know right now u might be scared that you'll never be able to do stairs again.
Looking at the stair must scare you.
I know.
The same thing happened to me , I did LON on tibias,
This is happening because
1. you have no balance
2. your anti gravity muscles are weak
HOWEVER, you mentioned you have no nail in and are not 100% consolidated so i would wait till 100% consolidation to try this
You have to get a habit on balancing yourself on one leg and doing one leg squats.
PLEASE DONT DO THIS TILL YOURE A 100% CONSOLIDATED
however,
Also train your anti gravity muscles.
Those are : calves ( gastroc and soleus) , thighs ( Hamstrings and quadriceps ) and your glutes including the hip adductors and abductors.
you can purchase a step like this from amazon to start practicing (Thats what i did)
https://www.amazon.com/Tone-Fitness-Aerobic-Exercise-Platform/dp/B07TZSX3D3/ref=sr_1_5?crid=1PPY2BQH7ALB8&keywords=step&qid=1701011028&sprefix=step%2B%2Caps%2C263&sr=8-5&th=1A physio should help you.