Which subscription do you have? The Lightroom CC subscription comes with 1TB of storage space, which should be more than enough, but the Photography Plan subscription only includes 20GB as it includes Photoshop too.
Hi Carmen, it looks like you have a Student & Teacher Creative Cloud Photography plan which has 20GB of storage. Are you only using Lightroom CC?
Or do you use Lightroom Classic and Photoshop CC as well?
Note: Lightroom CC syncs the large original, full size file which is good if you want your files backed up and access to the original files on all your devices. Lightroom Classic only smaller Smart Previews, which is not a backup solution, but doesn't eat up as much storage.