This is a bit hard to explain on an eli5 level, but basically, charge has nothing to do with size really. Charge comes from the even smaller particles in protons and other Hadrons called quarks, which carry a fraction of an electric charge of an electron. As for shrinking down a proton’s size so that it is the size of an electron, this is kind of nonsensical and so a bit of a non starter. You cannot really squeeze down a proton to a smaller size.
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