Charisma and personal magnetism, positive energy or high vibration is not a "gift" as such. We have it all within us. That means that everyone can develop and raise this frequency so to gain more charisma and the success which comes with it.
As you can train your body you can train your mind and spirit. But you must be aware of that you can be a charismatic person without being a spiritual being, some dictators proved that to us, so the most important is to raise your personal frequency spiritually in promoting the positive thinking, such as universal love, respect and free will.