How to remove system storage on Mac?

See image attached. I have a 2017 MacBook Pro 3.1 intel 8gb memory 256gb storage and have been trying to bring down this system storage size with no luck. I’ve gone through and cleared all cache, application support, user backups and still have not been able to bring this system size down.

When I get info on the hardrive in finder I also see the same issue- only 264mb of storage remaining. I’ve added up all of my file storage and only come up to about 115gb used. I know OS will take some of the storage but is 147gb realistic???

Any suggestions? TIA

See image attached. I have a 2017 MacBook Pro 3.1 intel 8gb memory 256gb storage and have been trying to bring down this system storage size with no luck. I’ve gone through and cleared all cache, application support, user backups and still have not been able to bring this system size down.

When I get info on the hardrive in finder I also see the same issue- only 264mb of storage remaining. I’ve added up all of my file storage and only come up to about 115gb used. I know OS will take some of the storage but is 147gb realistic???

Any suggestions? TIA