There is no one-size-fits-all recipe for transformation, but that doesn't mean consultants and methodology firms aren't lining up to sell you one. Be it the ubiquitous SAFe, the "Spotify model" (which Spotify quickly outgrew), or some other lovechild of Scrum and RUP with its own cutesy vocabulary, the kitchen has decided what you are having without even asking what you want.
The usual counter is that every organisation and context is different, so it needs its own unique recipe which you need to figure out from scratch.
I think the truth sits somewhere in between. Each situation needs its own contextual approach, but you don't have to start from nothing. I have spent the last decade exploring, applying, rejecting and adapting all kinds of principles and guidelines, tricks and techniques, and successful playbooks for specific contexts.
I won't try to sell you a recipe for transformation, but I will share some change cooking tips that might mean yours doesn't fall flat!