I have deleted a lot of my files on my iPad and am still getting a message that my storage is full

The only remedy to having too little space on your device is to identify and remove unwanted data - however, some might be difficult to identify.

You have given no details as to the model of your iPad, its capacity, or any details of the data that is currently stored on your iPad. As such, we have little with which to offer specific guidance. You might choose to share more information about your device.

Your iPad model number and details can be accessed here:

Settings > General > About

Details about your storage capacity and usage can be found here:

Settings > General > iPad Storage

Here is an example:

In this illustration, you can see the relative usage of different categories of data locally stored on the iPad. Here (looking from the right), the largest light-grey bar is empty/free space, then you’ll see a very small darker-grey bar corresponding with “other”, then a green bar for “Messages” and so on.

If, when looking at your own data storage usage, you see that the “other” category is consuming an disproportionate amount of space on your iPad, this support page may be helpful to you:

Clear Other storage on your iPhone or iPad - Apple Support

I hope this information and guidance proves to be helpful in resolving the issue.