GPUs can be costly, so if you find that it's not being used, you can scale your instance to a CPU instance. This is great if you're doing workflows that don't need the GPU, or if you're writing code/massaging data.
Note: Scaling your instance will temporarily pause the instance
Scale your instance
From the console:
From the console, click on your instance to go to its settings page
Click on the "Hardware" tab to scale your instance
Click on CPU to see the different instance types
Once the new instance is selected, click Deploy Changes and hang tight while it updates
From the CLI:
See the scale CLI docs for more information.