According to its inventor, Scrum™ was created to manage a team of dysfunctional COBOL programmers at a bank[1], not to find a Product/Market Fit (PM/F).
Instead of using an SDLC methodology here, use one of the relevant product frameworks for that, but needless to say, there is a large element of luck here, as finding a PM/F isn't guaranteed.
Usually you use low-tech SDLCs like Scrum/SAFe at the places that already have found PM/F, or those relying on violence (aka "taxation") as their main business model (e.g. military/government/public sector).
The only PM/F Scrum Inc found is how to make bazillions from useless certifications and training.
Instead of using an SDLC methodology here, use one of the relevant product frameworks for that, but needless to say, there is a large element of luck here, as finding a PM/F isn't guaranteed.
Usually you use low-tech SDLCs like Scrum/SAFe at the places that already have found PM/F, or those relying on violence (aka "taxation") as their main business model (e.g. military/government/public sector).
The only PM/F Scrum Inc found is how to make bazillions from useless certifications and training.
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[1] Scrum | Dr Jeff Sutherland | Talks at Google
https://youtu.be/2L1oBLTICx4?t=1217