Just pick the art that fits you. I have found young tall slim men with long legs are perfect for Taekwondo due to TKD emphasizing so many kicks. Others may prefer Shotokan as it’s more a 50/50 hands and feet. And stocky guys may lean toward Jujutsu with it’s grappling.
Or if you want just plain self defense without kata or so much formality, then Krav Maga is a very good one and a fine addition to your skill set when carrying a gun.
“We can evade reality, but we cannot evade the consequences of evading reality” Ayn Rand