Running it from the command line will not help.
I’ve calculated the raw size of a L2A product in GeoTiff. It is 243 GB.
The reason for this is that we have to use a common data type for all bands.
You can reduce the size for example by removing all the view bands for the specific bands and keep only the mean bands.
Also you can split your product into 2 products. One for the sun/view bands and one for the other bands.
Then the sun/view bands are stored as float32 data type and the other as uint16.
Additionally you can enable a lossless compression for the BigGeotiff.
Add to the snap.properties file (in installdir/etc) the following line:
snap.dataio.bigtiff.compression.type=LZW