Paperspace Deployments are containers-as-a-service that allow you to run container images and serve machine learning models using a high-performance, low-latency service with a RESTful API.
Depending on how you have setup your deployment, it might use some of your storage to save data, due to this, disabling a deployment and/or deleting it might be the best option to save up some of that storage.
In the tutorial shown here, you can learn how to stop a deployment.
Now, to delete a deployment, you have to follow these steps:
Select the project that holds the deployment you want to delete.
Click on the Deployments tab