The strategy says where you are going. The operating model says how you will work to get there. We draw the target picture of structure, processes and roles with you, then the gap to where you are today.
That needs a different structure and processes.
Or gaps nobody owns.
That requires work to be rearranged.
As it is really run.
Structure, processes and roles.
And sequencing the move.
With simple diagrams.
Who decides and who delivers.
In phases.
With the people who run it.
And settle them.
And test it on scenarios.
And hand it over.