I feel with you, we just had a very similar post a couple of weeks ago.

If the suitcase has been gone for more than 21 days it will officially count as lost and I would go after SAS to get the full compensation of a little over 1288 SDRs.

In any case I would keep pushing SAS and the contracted handler or delivery company. Also make sure to look at what WorldTracer says where your luggage has been shipped to. I would assume based on your information it is somewhere in Amsterdam with the delivery company (which can be horrendously unhelpful).
As a future tip, I have had to deal a lot with lost luggage a lot and so far always managed to get reunited thanks to my AirTag. It has saved me countless of times in discussions of "It is not here", as I could then show them exactly where it shows my luggage to be located. Had to do this in CPH countless of times (baggage is in the holding room, but not yet in the system) or here in Boston, where the delivery company kept claiming that they don't have my suitcase until I told them the address it was at, showed up at their warehouse, pointed to which was mine and then left with it.

Good luck!