Here's an honest answer for you: I boxed for many years before I became interested in the martial arts, and currently am devoting myself full-time to Bujinkan Ninjutsu. Ninjutsu is an excellent supplement to your boxing skills, but I'm not going to say it's the only one. Judo, jujitsu, BJJ, wrestling, all are good supplements to one who is mostly a puncher. The punching will be a lot different from what you're used to, but soon you can get to the point where you'll be hitting just as hard if not harder. The weapons training will also be of a huge benefit to you. These are just my opinions, though, I'm sure any other martial art with kicking and grappling would benefit you just as well.
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