Have you emptied the trash lately?
See if you have 50GB of files you can move or delete.
You can use Drive DX to possibly get a better view of Drive health…
https://binaryfruit.com/drivedx
Delete these files & restart...
/Library/LaunchDaemons/com.apple.installer.cleanupinstaller.plist
/Library/LaunchDaemons/com.macvpn.MacVPNHelper.plist
/Library/LaunchAgents/com.support.com.ScreenCapturesrvd.plist
/Library/LaunchAgents/com.support.com.Nexusd.plist
/Library/LaunchAgents/com.support.com.Nexussrvd.plist
~/Library/LaunchAgents/com.movavi.screencapturestudio3.screencapture.startup.plist
~ tilde indicates your home folder
Apple hid the Users' Library folders...
Method 1:
1 From the Finder, select the Go menu at top of the screen, and choose Go to Folder.
2 In the window that opens, enter ~/Library, and click Go.
Or…
Use the Command-Shift-period