I want to buy iCloud space
My few apps are not working because of storage is full
iPhone 8 Plus, iOS 13
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See: Buy more iCloud storage - Apple Support
Also note that more iCloud storage only helps in a limited way with a shortage of space on a device. See the following from About storage on your device and in iCloud - Apple Support
Free up space on your device
You can make storage space available on your iPhone, iPad, or iPod touch when you use iCloud Photos and turn on Optimize Storage. Or you can remove content from your apps—like photos, music, and Podcasts—or delete the apps that you're not using.