Your volume is currently provisioned at 500 MB with 495.5 MB used (99%), which is why the service is struggling. Your Pro plan supports volumes up to 1 TB, so you can resize it directly from the volume's settings page in your project dashboard - enter a larger size and apply the change. The resize happens live with no downtime.

inactivated resize

To correct our earlier message, your workspace is on the Hobby plan (not Pro), which supports volumes up to 5 GB. Your volume is currently at 500 MB, so you have room to resize up to 5000 MB. In the screenshot, the Resize button is inactive because the confirmation text field is still empty - type the phrase shown in the dialog and the button will activate, then you can choose a new size on the next step.

I've already done. but I can't

The volume is still at 500 MB, so the resize has not gone through yet. In the second screenshot, the confirmation field contains "1000 MB", but the dialog is asking you to type the exact phrase I want to resize the volume instead. Once you type that phrase, the Resize button will activate, and you will choose the new size (e.g. 1000 MB) on the following step.