Is there any proverb for "when one starts shaping up after losing many times". For example, I have failed in Maths test many times, but now I am taking it seriously and working hard to pass next time. The essence is that, I reacted after having much loss, rather than taking actions on time (much earlier).
Moreover, the proverb I am looking for is related to a situation when a frog keeps regulating their body temperature in boiling water, but in the end gets cooked.
There's a proverb in Urdu:
ﺁ ﺑﮯ ﺳﻮﻧﭩﮯ ﺗﯿﺮﯼ ﺑﺎﺭﯼ‘ ﮐﺎﻥ ﭼﮭﻮﮌ ﮐﻨﭙﭩﯽ ﻣﺎﺭﯼ
Translation: to shape up after having much loss, or continuous failure.
In addition, I thought that the following words would define it but not l sure about it as it looks like a quote:
"never leave for tomorrow that which you can do today."
I hope there's a English proverb for which I am asking here.