It’s impossible to reduce gravity, but you can find some clever ways around it.
Even if the magnitude of the gravitational force and the buoyancy force were equal, having a different location for the center of mass and buoyancy will mean the object won't be in equilibrium. Here's a quick demonstration that you can try. Take a pencil and place it on a table so that it's pointing away from you. Now put your right and left fingers somewhere near the middle of the pencil and push them towards each other.
There's another problem with walking underwater: the water. Here's another experiment. Take your hand and wave it back and forth as though you are fanning some air. Now repeat that underwater. You will notice that in water, it's much harder to move your hand. This is because the density of water is around 1,000 kilograms per cubic meter, but air is just 1.2 kg/m. The water provides a significant drag force whenever you move.
Yes, it's complicated. But from that theory, we also get the equivalence principle. This says that you can't tell the difference between a gravitational field and an accelerating reference frame.
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