IK did not stop corruption, especially in CPEC and Punjab. His policy of spending money on (own) image building such as trying to start a TV channel along with Turkey and Indonesia, billion tree tsunami at a time when the country was debt-ridden was wasteful expenditure.
The only reason he survived 3.5 years was because COVID stopped economic activity reducing energy prices and moratorium on loans was provided by all lenders. He more than doubled external debt with no plan of paying back. IK was hoping for a miracle like discovery of oil and gold, whih might be due to superstition. Superstition is not a sound economic policy. By the time Khan realised that there was no oil or gold which would suddenly turn Pakistan into a rich nation, he panicked and from then aap thoda ghabra sakte hai.
https://www.dawn.com/news/1471138 Pakistan may soon hit oil, gas jackpot: PM