Why do you want to learn JJJ? I would suggest Judo or Sambo instead. JJJ is pretty useless if you already know bjj and muay thai. Also, how long have you been training bjj? It seems weird that you're getting "tired of it" as it's such a complex martial art that takes years and years to master/understand
What a stud
The power of Aleks, his small baby and pimp hardcore dogs has granted you useful insight, my friend.