Hello Donot Haveone and welcome to Apple Support Communities.
I understand that you’d like to remove existing shortcuts from your device, in addition to preventing any future use or suggestion regarding shortcuts.
The information outlined below details how to go about doing so:
Go to Settings > Siri & Search and tap My Shortcuts.
To change the phrase for the shortcut, tap the shortcut, then tap Re-Record Phrase.
To delete a shortcut, swipe left over the shortcut and tap Delete. Or tap the shortcut and tap Delete Shortcut.
If you don’t want to see Siri Suggestions or Shortcuts for a specific app, go to Settings > Siri & Search, then scroll down and tap the app. From here, you can turn off all Search, Suggestions, and Shortcuts for that app. Or turn off Allow on Lock Screen to remove suggestions for that app on the Lock screen.
Go to Settings > Siri & Search, scroll down and turn off Suggestions in Search, Suggestions in Look Up, or Suggestions on Lock Screen."
Use Siri Shortcuts
You may also want to check the additional options in Settings > Siri & Search.
Cheers.