How to open another Account's User folder using Terminal?
Jump Desktop will allow you to log in to the same computer you are using as a different user. You will have access to all of your files and apps.
I have not done this extensively, but I did test it and it worked in Jump Desktop.
The default macOS Screen Sharing.app will not do this.
Screens 4 seemed like it was going to work, but it did not successfully connect.