You have a good start. You should cite your sources and possibly change the title from 'antonym of corrupt' to your specific question 'going from good to better', although I think paralleling corrupt with what you are looking for is useful. Antonym questions are treated poorly around here. Also, adding an example sentence or two with a blank will help establish the context for the word you are seeking. The headline example you give is good, but make that more obvious.
The tag wiki for single word requests should help you out here. I think you've almost got it.