Rather than using the Storage settings in the Settings app, using Disk Cleanup to delete anything that can safely be deleted is the best option to clear as much space as possible on your C drive safely..
1
Open File Explorer
Click 'This PC' on the left.
Click on your C drive on the right.
Click the 3 dots on the top menu, then select Cleanup
Let Disk Cleanup do its initial scan
Select Everything in the list and choose Delete
2
Start Disk Cleanup again
Let Disk Cleanup do its initial scan
Very Important - this time in the resulting dialog, click 'Cleanup System Files'
Let Disk Cleanup run another scan
Select Everything in the list and choose Delete