When I first started in real estate, I thought the once the deal was closed, that my job was pretty much done. Through the years, I have learned, that this is not necessarily so. Some service items are necessary to aid the buyers and sellers and some are good just to stay in touch with the clients for future business.
A few tasks I remember doing which should count for something:
Getting the title on the house changed to their trust
Helping with home warranty claims
Questions on property taxes
Help with remodels and repairs
Questions on doctors, hairdressers, etc.
I have had clients contact me with questions on just about any part of their life and I am glad to help!