if you tap/hold on a blank spot on your Home Screen so that all the apps wiggle..
Tap the dots near the bottom of the screen, right above the dock.
It should tile all of your Home Screens and allow you to check/uncheck them in order to hide or display your different Home Screen pages.
Is there one of them that's unchecked?
If you cannot find the missing Home Screen, you should be able to add apps back to your Home Screen manually from the App Library:
From your Home Screen, swipe left until you get to the App Library.
Swipe downward and you'll get an alphabetical list of your apps.
Locate the app in the list or type the app name into the search field
Once you've located the app, tap/hold, then drag and it'll pop out to your Home Screen
Organize the Home Screen and App Library on your iPhone - Apple Support