What's on your "C" drive? What size is it? How much free space do you have left?
Maybe an image might help us spot something.
Perhaps using something like WinDirStat might help you get a handle on what's consuming your space https://windirstat.info/download.html
How long have you been running Windows 10 on the system?
You may still have Windows.OLD as well as the files downloaded to facilitate the upgrade on your drive. Which you need to leave in place until your month has expired.
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