I just added more storage, I upgraded to the mix and it’s say my storage is still full. What do I need to do.

There is a lot of confusion. Adding iCloud storage will not free up space on your ipad. All it does is add more online space so you can sync items on your devices.

You will need to look for items on your iPad to delete or offload elsewhere to free up space on your device

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

Manage your iCloud storage - Apple Support

iOS devices have fixed amounts of internal data storage space that cannot EVER be added to/increased!

Any type of offsite, online data storage/backup service is a secondary data storage/backup location that DOES NOT increase the internal storage of any iOS device.

cloud and other data storage/backup services are for uploading data OFF of your iOS device to free up the limited/fixed data storage space on your iOS devices.

If you need to free up free data storage space on an iPad/iDevice, you need to start by backing up your iPad to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes and/or some other offsite, “cloud” data storage/backup services, like Google Drive/Photos, DropBox, BOX, Amazon Cloud Drive, Flickr ( for photos/images ), etc.

Then, delete any installed apps that you no longer use or use infrequently enough that they aren't missed (you can always reinstalled any purchased or free apps at some time later, as you need them).

Then, thin out/delete any music/videos/movies/TV shows/podcasts/screen recordings/images/eBooks/

eMagazine/iBooks/audio books/Documents/PDFs, etc.

If you use a POP email account on your iPad, delete/thin out any old saved emails that maybe saved to your iPad.

To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.

Also, you can check to see what other stuff is eating up all your valuable data storage space by going into the Settings App,,General Settings Panel, in the right hand column, tap Storage & iCloud usage panel ( in iOS 11, it’s iPad Storage ), in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.

Then, do a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.

iOS devices and iOS/iPadOS need to maintain, at the very least, a minimum of between 2-3 GBs of free data storage space, AT ALL TIMES, to insure normal/nominal functionalities/operation and general overall performance of any iOS device running iOS/iPadOS.

Good Luck to You!