Diskmgmt unable to shrink partition with free space

[Windows 10]

On my main C:/ drive, there are 130 GBs of free space, which is visible in diskmgmt. However, when I try to shrink the partition, it says there are only around 8GBs of available shrink space in the new menu.I tried using other third party programs to shrink the partition but they also didnt work.Any ideas?

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