You can increase your available storage space by...
Upgrading your Pastela Plus plan
Upgrading your plan will provide you with additional cloud storage capacity.
For details on the storage capacity available with each plan, please see here.
Deleting canvases you no longer need
Canvases in your "Deleted recently" still take up storage space.
If you have any canvases there that you no longer need, delete them permanently to increase your available space.
To learn more on how to delete canvases, please see below.
How can I permanently delete canvas data from the cloud?