I assume you hit Publish to make the change take effect?
It can take several hours, even a day, for a price change to show up on the product page. And if you have the book priced lower elsewhere, it won't change at all unless you change the price elsewhere. Good luck!
I increased the price by 2.99$. and also submitted on publish option. After being my book live , it is showing 2.99$. but when i checked it on amazon kindle, then i saw that the price is still 0.71$. and not changed to 2.99$.
Please help me out of it.