My El Camino came with 35 years of receipts, listing all the previous owners with their addresses and phone numbers. All except for the original owner. When I finally did find his name and address I learned he passed away the year before.
As mentioned above, it's not easy these days but there are numerous avenues. If you have the previous owners registration that came with the car you can reach out to them asking if they have any prior owner information or registrations. I ran the VIN from my daughters Camry online and came up with the two previous owners and all Toyota maintenance done to the car.