My PC is randomly using up space

[KikiBG]

One day I'll have 30gb free. The next day, the remaining storage drops to 20gb. This has been continuing for weeks now. I've had to delete things just for more storage to be taken up without me doing anything to warrant that.In addition, I've used TreeSize to discover that my Windows folder is eating up 91.2GB ALL ON ITS OWN. There is also a folder within Windows called CSC that's taking up 62.4GB and I can't delete it. I've tried taking ownership but it does not work. I need help as I'm constantly losing space daily

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