You can move to the other User via the Shared folder.
Transferring files from one account to another on the same Mac
Use your Shared folder: Your Hard Drive/Users/Shared
- Log in to the account you wish to copy files from. Let's call this User Original
- In the Finder, navigate to the Shared folder.
- Drag Shared folder to the Toolbar. Select Icon & Text.
Create a folder in shared for Desktop. I like to use folders I create not the root folders in Users. Drag items from Desktop into the "desktop" folder you created. If you drag the root folder it can give you permissions issues when you copy into the new User.
Log out of the current account under the Apple in the Menu bar or use Fast User Switching.
Log into new User.
Add Shared folder to Toolbar in the new User.
Drag items from "desktop" (it actually copies) to the Desktop.
Log back into the User Original
Delete the files from Shared you copied over to the new User.
Continue doing this for Documents, Music, Movies, Pictures etc. The User's Library folder is one you need to be very careful in what you bring over. Most likely the issue is in your User's Library. Mail and most of the items in Application Support are safe to bring over. Safari and Calendar only if you are not syncing via iCloud. Keychain can be brought over but best to start fresh. Keychain tends to keep a lot of old entries and starting fresh eliminates all the crud that has accumulated.
If you are low on disc space be careful since this copies data. Move one item at a time then delete the original before starting the next copy.
Remove User after you have all data copied to the new User. Go to System Preferences > User's & Groups. Select the account and click on the - to remove. You might want to leave the original User with the User's Library in case there is something you really need but did not move over.
