I already commented about using Omni Disk, but it didn't seem to go through.
You can use Omni Disk Sweeper to go through the file system and give you the exact location of the space usage, Helped me reduce 30 Gigs but also research a bit about the path that you are deleting from to avoid having to re install the whole OS again.
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I actually have reformatted many times because of this.
Nevet even tried add more SSD approach.
I already commented about using Omni Disk, but it didn't seem to go through.
You can use Omni Disk Sweeper to go through the file system and give you the exact location of the space usage, Helped me reduce 30 Gigs but also research a bit about the path that you are deleting from to avoid having to re install the whole OS again.