I have myopia.
It started at 150
After a few years become 250
Then a few years become 350
I always wonder why it kept increasing

Then i abstained myself from wearing glass when not needed
3 days before checkup I abstained not wearing glass at all
Then at checkup turns out it is 250..
So i made my new glass 250
Now I am training to go 150

I found out if u test your eyes immediately after taking off glass will result in higher reading then it should be because eyes is used to the glasses. Your eyes should be allowed to relax and stretch before doing eye test.

There's also the training glass with small pinholes pattern(i think pharmacy have)

Also eat lots of carrots

Hope this helps