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It's certainly possible, & you could have done it originally, unfortunately the method isn't so obvious there.
Without a screen shot of the current layout, the easiest method is hard to be sure of.
If your C partition is the end one you can just use Windows disk management to expand it, if it has a partition after it it's a bit more complex, but you only need an external drive with enough space to store an image of your drive as it is.
You want such storage anyway for ongoing backups, an external hard drive suits most people, they can be quite inexpensive, it doesn't need to be an ssd & there isn't that much advantage to them for external backup storage apart from withstanding bumps or knocks much better.
During either an image restore or clone operation, instead of just clicking next, you drag the partitions down from the source to the destination one at a time, when you get to the C drive, you click "restored partition properties" expand it to leave just enough empty at the end for the partition after, then drag that down. If you'd known you could have done that first time round, the free version allows it.
You could theoretically use a third party disk management software like GParted to move the end partition & expand the Windows one without needing external storage, only you really need a backup before starting something like that in case something goes wrong, & once you have the backup, you don't need GParted anymore because you can restore as described above...