Hi, don't worry, though you have tried some common ways, there are still other fixes you can try.
( 1 )Restart your Mac. Apple menu > Restart.
( 2 )Try to enter Mac Safe Mode.
( 3 )Remove purgeable space. If you find the amount of free disk space in Disk Utility is less than that in Finder, there could be purgeable space on the drive. Let's delete the purgeable room with some reliable software like iBoysoft DiskGeeker.
( 4 )Reindex Spotlight. Apple menu > System Settings > Siri & Spotlight > Scroll down and find Spotlight Privacy, click the add button select the disk to add, then select the disk that you just added, and choose the remove button. Click Done.
( 5 ) Repair the drive. Open Disk Utility, select the wrong drive in the left menu, then choose First Aid on the top, then click Run then Done.
Hope you can fix your problem.
Also read: How to Fix macOS Shows Different/Wrong Free Space
