Hello Jeany,
This page here can help out with providing some helpful info regarding the shutdown of 'My Photo Stream': Information about the My Photo Stream shutdown - Apple Support
On there it'll help to note, "The photos in My Photo Stream are already stored on at least one of your devices, so as long as you have the device with your originals, you won’t lose any photos as part of this process. If a photo you want isn't already in your library on a particular iPhone, iPad, or Mac, make sure that you save it to your library on that device."
On your iPhone, iPad, or iPod touch
1. Open Photos and tap Albums.
2. Tap My Photo Stream > Select.
3. Tap the photos that you want to save, then tap the Share button > Save Image.
On your Mac
1. Open the Photos app, then open the My Photo Stream album.
2. Select any photos you want to save that aren't currently in your photo library.
3. Drag them from the My Photo Stream album to your Library.
If the Albums section doesn't contain a 'My Photo Stream' album then it's possible that this particular feature wasn't currently enabled/in use. If you happen to already be using iCloud Photos on all of your devices then this will be helping them to stay in sync.
Cheers.