Air, fuel and compression.
If you're confident of the fuel supply and return system, then the AFC is the next place to look. Check the manifold-to-AFC line; if the AFC doesn't see boost, it won't increase fueling. Years back when my heater relay(s) stuck on, that hard black plastic line melted at the manifold and the AFC saw no boost. Can you say '0-60 in the same day'? Sure. I knew you could. It took almost that long to accelerate.
Less likely, make sure the turbo spins freely and that sufficient air is pulled into the turbo. And check the turbo wastegate. If it's stuck open, it won't make much boost.