You can't change the eight characters you were born with. But name and location changes can shift how the chart expresses.
Name changes: In Chinese metaphysics, names carry elemental frequencies based on the characters' stroke counts and associated elements. Adding characters with your Useful God element can create a subtle supportive field. It's a gentle nudge, not a chart rewrite.
Location changes: Moving to a region aligned with your Useful God element (e.g., a Water-deficient person moving near the coast) can provide environmental nourishment. This is one reason people feel inexplicably "at home" in certain places.
These adjustments are supportive practices, not chart replacements. They work best alongside inner cultivation, not as substitutes for it.