It's not the style that matters its way you're taught it, many people think that because they have achieved black belt they are proficient to teach and don't have to train any more, this is a big mistake. You never stop learning; even after your 7th Dan and that should be about 30 years of training. If you don't train with an instructor you limit your knowledge and understanding of karate-do.
You should look for someone that is compatible with your physical structure, and for training that will benefit your knowledge and experience. Helping you understand different maturities and structures, this in turn will increase your input and enthusiasm to train and fulfil your ambitions.
You will fill much more confident in your self and fill a sense of achievement, just remember the only home you have is the one you stand in, so take care of it.
To be proficient in karate-do one should train a minimum of twice a week at hour and half per class, and if there is a monthly course try to attend it, you will be amazed how quick you will learn.
When you not training at a club on your day's of rest, try and do some light training incorporating what you have learnt and do your own research. Give your self a program that you enjoy and be honest with your self and do it, if you miss one day do double the next. remember if you don't you are only cheating yourself no one else.
Karate-do is a subject one can do all one's life; all you need is the apparatus you stand in.