You cannot permanently delete Amazon purchase history from your account
You can archive orders to hide them from the default order list
Sign in to your Amazon account
Go to Your Orders
Find the order you want to hide
Select Archive order
Confirm the action
To view archived orders, go to Account & Lists
Select Your Account
Open Archived orders
To reduce visibility, delete browsing history from Your Browsing History
To remove items from browsing history, select Remove from view
To manage recommendations, go to Your Recommendations and adjust preferences