Eesh, that does sound rough. The last Samsung phone I owned was the Galaxy S5, I see on the Wikipedia page Samsung devices have been locked down since early 2021 :(
Not like I would try to give you advice on unlocking your phone in the first place as I'm mostly clueless myself.
Maybe time to trade up or sideways? Graphene OS only officially supports Google Pixel devices anyway(for now). If Motorola could somehow recapture the magic of the Razer today with a new phone, that would be cool too!