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It can be switched back on from iTunes. With iTunes open got to File > Home sharing and make sure Home Sharing is on using the same apple id on your mac and apple TV.
From the same Home Sharing menu in iTunes select > Choose Photos To share With Apple TV. Check the box to Share photos from the photos app and then select if you want to share all or only some of your albums to apple TV.
apple TV is connected to SAME Wifi as the Mac....yes?
and using the SAME apple ID on both the Apple TV, as you at on the Mac?.....yes?
you have to login on the Apple TV, using the SAME iCloud Account that you are using on the Mac.
If you've chosen not to use iCloud Photo Library on your Apple TV, you can still access iCloud's My Photo Stream feature, which lets you view the last 1000 images you took on (or uploaded to) your iPhone, iPad, or Mac. This feature can be used in tandem with iCloud Photo Sharing, or by itself; it disappears if you enable iCloud Photo Library.
Unlike Apple's other devices, your Apple TV can't download images from the web or Messages to add to your Photos library — it relies solely on iCloud's photo sharing options to present your images. As such, you'll need to log in to iCloud on your iPhone, iPad, Mac, or PC to make that happen, then turn on one of iCloud's photo sharing options.
Launch the Photos app on your Mac.
On the Photo App, in the upper left hand side, click on Photos, (a menu will open and drop down) then click on Preferences menu.
When you click on the Preferences.....a window will open.
at the upper left you will see 2 tabs.......General and iCloud. Click on iCloud.
Once you click on iClound (upper left) now look in the options and Check "iCloud Photo Library." This will begin uploading any and all images you have stored in the Photos app to iCloud.
Once this happens.....your Apple TV will be able to View them.
So long as the Apple TV is also using the SAME icloud account.
It looks like I will now be working with you. Let me go through the history and get caught up.
Let me know when you are ready to resolve this. I put photo's on my Apple TV all the time from my iMac at home. I can help you get this resolved.
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This is the answer: https://support.apple.com/kb/PH15209?locale=en_US