In the BJJ universe, we often see karate as a mcdojo sport. Don't get me wrong, it is probably a really good martial art, but promoting 13 year olds or guys that's been training for 5 years just isn't right.
By the time you train karate and get your black belt, you would probably still be a blue belt (second belt) in jiu jitsu.
Definetly, you should try BJJ, MMA or muy thai and see which ones fits you the best!
When we go to the ground, you are in my world. The ground is the ocean, I am the shark, and most people don't even know how to swim. - Rigan Machado