Nice to hear from you!
Well, my ankle strength routine is really nothing special, but the most important is I try to keep it the whole year round, 5 times per week, about 5 minutes per day.
I use this type of bosu ball:
I start by standing on it with only one foot during 1 minute. Closing my eyes if I find it too easy. [2`]
Then, I start one foot jumps (either I use just one bosu or the two I have, jumping from one to another). One minute per foot, no stop. [2`]
For the 2 last minutes, I throw a soft ball against a wall, and have to catch it (always one foot at a time).
That´s it. At the same time, it strengthens my ankles and achilles
When I am at the gym, they have this kind of rebounder which makes the part with the ball a lot more fun: