As one wrote, you will soon be a jack of all trades and a master of none. You just can't pick and choose techniques from various styles and think you're putting together a serious martial or fighting method. Doesn't work that way, never did.
They are all good, there is no such thing as a crap martial art (except Krap Maga), only crap martial artists.
4 martial arts? No, that is wrong in every sense of the way. You can not possibly have enough time to be able to commit to one martial arts and learn enough to become good at it, let alone 4 martial arts. 2 is more than enough. Besides it has to get pretty expensive.
The martial arts you do now are enough. How long have you been training it? I'm assuming not very long. Give it time. As they say, Rome wasn't built in a day. Everyone has areas in their martial arts that they are bad at. Instead off starting something completely new train more at that area you need work at. Stay after class with one of the more senior students and ask him to help you. There are things to do. People don't realize the commitment and time it takes to start and learn a new style.
If you're looking for something you can use in competition, then judo will teach you some close in skills - takedowns, pins, throws, etc.
If you're looking for something for self defense in a street fighting situation, I'd look into Krav Maga.
So i train 2 martial arts. Muay Thai and Brazilian Jiu Jitsu. I have good stand up skills. I can punch, kick, use elbows, knees and clinch. I have good ground skills. Submissions etc. But i think i dont have good takedowns, so what else should i train? I can maximally train 4 martial arts. So i have thinked that Sambo, Wrestling or Judo? Or karate? I have heard that Karate has some leg sweeps. Please help :) Thanks
