I am restoring my grandparents 1930s farmhouse. It has a concrete front porch with 2 pillars holding up a roof. It's raised, sitting on cinder blocks, but is about 4 feet below the front door with concrete steps on top of the porch to reach the front door. Can the porch be raised to the level of the door, and the stairs be placed in front of the porch, or would it be cheaper to tear it out and redo everything?
Can it be - sure, just a matter of spending enough money.
Unless there's some particular reason to "raise" that particular slab of concrete, probably a lot less expense to leave it where it is and use it as a foundation for a platform 4 feet higher, if a platform 4 feet higher is what you actually want.
Tearing it out to build that new platform starting from new footings is probably a waste of money and effort, barring information you have not shared.