Hi, don't worry, this is easy to solve, you can try these fixes:
(1)Use a dedicated app uninstaller to completely uninstall apps on Mac. If you have permission, you can delete any apps on Mac with the useful tool iBoysoft MagicMenu. It also will clean the leftovers together.
- Free download, install, and open it.
- Click Extension and find and download the Uninstall App.
- Right-click your unwanted app and choose Uninstall > Uninstall > Yes.
(2)Disable SIP to delete system apps on Mac in macOS Recovery Mode.
(3)Force quit the app that won't delete.
(4)Kill processes related to the app in Activity Monitor.
(5)Uninstall Steam games.
Hope you can fix it finally.
Also read: How to Delete Apps on Mac that Won't Delete from Launchpad/Finder?