Something to consider in the mean time is everything you're not doing in physio.
For example, it's a good idea to examine your footwear. Think of how people often say they rolled their ankle when stepping on something. This could be someone else's foot, or stepping on the side of a curb.
Found. Original Source.
So, the higher your foot is off the ground, the more easily it can roll over to sprain. A shoe with a big heel lift provides room for the ankle to sprain:
Source: Can foot and hip pain be related?
Think of the plate as a curb, lifted shoes, whatever. You can imagine if that foot is only on the ground, it's harder for the ankle to sprain.
Another aspect to consider is how you hold that ankle throughout the day. After a sprain, it's common for the ankle to become lax / hypermobile. For instance, you're laying down. Rather than the foot be held straight,
It lays like this:
One of the main ideas of strengthening the ankle is to tighten up what was stretched out in the sprain. We can do that throughout the day too though. For instance:
Images from b-reddy.org
If you're Steph Curry, who has a history of nasty ankle sprains:
Then you don't want to be sitting like this:
Rather you want that foot flat:
And you might want to be careful about playing golf, doing this to his ankle:
Close up from one of his sprains and another one of his swings:
Curry media from How golf can negatively impact the ankles.
I use Curry as an example due to his fame, but the principle is don't ignore the other 23 hours of the day. You might attempt to tighten your ankle with 30-60 minutes of exercise per day, but if you're holding the ankle in a stretched position many hours outside of the exercise, it's hard to offset that.