Nearly out of disk space

Hi All!

I'm using a virtual machine running Windows 10 and I keep getting a notification that I'm almost out of disk space on the C drive. I increased the size of my virtual disk by about 20GB, but now I'm not sure how to allocate that extra space to my C drive specifically. I know how to partition it as a separate drive, but that doesn't get the error message to go away b/c it's the C drive that is almost full.

Any ideas? Thank you all so so much. Seriously appreciated.