A350 bed far from level

First most simple question asked: You did the bed levelling/calibration procedure? Perhaps switch to 5x5 pattern and see if you fare better.

Most likely you are - like many others - suffering from a bad print platform. If your SM2 is rather new, contact support - I think many others received a replacement for the platform. Or search the forum for bed levelling issues - you’ll find tons of advice. This one might be good starting points: