So sorry to hear that you deleted the 3D.
No need to have done that.
If you open your VIEWS toolbar and select TOP it would have taken you back to your PLAN view, as seen in a 2D perspective, without the loss od the modeling which yo had done in 3D.
Do you have a >BAK file of the drawing perhaps ?
If so you should open that one, and see if you 3D is still intact there.
Do you have AUTOSAVE turned on?
If so do you know where your AUTOSAVE function saves drawings?
Do not save your drawing again right now, as it risks deleting the previous .BAK file which may be the one you want to use to get your 3D work back.
Cadtutor, the forum that never sleeps, it is coming up noon in Indonesia, and I am happy to help you right now, if you need help.