Iphone photos not syncing to iCloud
I've recently upgraded my iCloud storage to 200gb, and when i've synced my iPhone, only some of my photos are showing in iCloud Photos. For instance i have around 5k photos on my phone, but when i look for them on the iCloud it only shows around 400 (with the earliest being from May this year). The photos on my phone take around 50gb, so i have more then enough storage on the cloud. Photos are turned on under iCloud syncing.
Can somebody please explain if i need to do anything else to sync all of the photos from my iPhone?
I'm using iOS 13.6.1, and macOS Catalina 10.15.6
iPhone 7