Hi there solmarisol,
If you are trying to manage your iCloud storage on a Windows PC, follow the most relevant section of this article: Manage your iCloud storage
However, deleting or making more storage available in iCloud will not allow photos on your iPhone to be automatically uploaded, especially if it is not connected to a Wi-Fi network. You would need access to the device in order to upload the photos that are not currently synced with iCloud.
This article walks you through what to do when you a have a missing iPhone as well: If your iPhone, iPad, or iPod touch is lost or stolen
Best regards.