... I have now reinstalled Photoshop but all my Presets, Actions and Brushes are gone.
Navigate to folder Users/[user name]/Library/Preferences
Which subfolder do you see here?
In any case there must be one folder named Adobe Photoshop [version] Settings
Is there another Settings folder? If yes, it’s possible that there you’ll find your presets, actions etc.
Note: The user Library folder is hidden by default.
To access files in the hidden user Library folder, see here for how to access hidden user library files.
https://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html
Do you have a backup of your Settings folder? In this case you can restore your personal data.
For more informations see here: Backup and restore preferences
My System: Intel i7-8700K - 64GB RAM - NVidia Geforce RTX 3060 - Windows 11 Pro 26H2 -- LR-Classic 15 - Photoshop 27 - Nik Collection 9 - PureRAW 6 - Topaz Photo AI