Someone keeps deleting my roads!

I spent HOURS on mapping many popular parking lots in my county and the work has all been DELETED! How can I find out who is doing this? This is totally unacceptable!

Agreed that it is unacceptable to delete these without someone having contacted/explained what is expected to be mapped - or not.
This:
https://wiki.waze.com/wiki/Welcome_to_WME
is a good starting point as a resource to get those questions answered.

Welcome to map editing and the forums.
I would also agree that contact should have been made to explain why items are being deleted, have you checked for any PMs (Private Messages) regarding this?
And I would encourage reading these two wiki items which specifically address PLRs and non drivable roads:
https://wiki.waze.com/wiki/Walking_trails#Non-drivable_roads
https://wiki.waze.com/wiki/Parking_lot_roads#Parking_Lots

Hello, all. Jared is referring to edits he did in and near Rocky Point, NY. I am in private conversation with him. Please consider this matter closed in the public forum.