Who do MSPs call when they can't figure something out?

I have a lot of experience needling through the stack and spotting performance/reliability issues for SMBs and big corporations. I have transitioned into Product Management but I am tired of being downstream of bad engineering or architecture teams who immediately turn on me when I point out design issues, barely utilized VMs, cloud caching/db services, etc.

Is there a type of consultant that MSPs rely on to unwind complex, recurring issues, or to help mitigate costs? I love solving the riddle but need to find the right spot where the stakeholders will be willing to receive an accurate assessment instead of trying to bury it. I have looked into FinOps but that space seems a little toxic and full of snake oil.

I would appreciate any advice you all may have to offer. Thank you!