How to make a purchased app unpurchased in App Store
Just wanna un purchased an app for privacy purposes
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You can hide it from your downloads list and what others see but you cannot delete it from your purchase history.
Hide purchases from the App Store - https://support.apple.com/HT201322
"If you don't want to see an app in your list of purchases in the App Store, hide it."
"What happens when you hide an app?
When you hide an app, it won't appear in your list of purchases in the App Store. If you use Family Sharing, the app also won't appear in family members' purchases and won't be available for family members to redownload. But the app will still appear in your purchase history."