Open the App Store on your iPhone, iPad, or Mac
Tap or click your profile icon
Select Purchased or Apps
Find the app you want to redownload
Tap or click the download icon
Enter your Apple ID password or use Face ID/Touch ID if prompted
Wait for the app to finish downloading
If the app is hidden, unhide it in your account settings first
If the app was removed from the App Store, it cannot be redownloaded from there