If you out your foot on the break and press down then start the engine, it’s normal for the pedal to sink further until it firms up again - that’s a sign the servo is working.
If you release the pedal then press it again, it shouldn’t go down as far as before you lifted it.
Assuming the pedal stays hard when you press it down, I’m not sure you have a problem with air that needs bleeding. If it is at all spongy, then there’s still trapped air. That can happen when the calipers are fitted on the wrong side of the car such that fluid enters at the top and the bleed nipple’s at the bottom, below the fluid inlet. Bleed it as much as you like, it will stay spongy.
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