by 

After doing black belt, you reach a plain, You climbed the mountain, you descended the other side and there’s a big open plain.

One way to cross the plain is to carry on intensive training and go higher up in belt ranks. And try other martial art

Another way is to try to apply the techniques into social justice or interactions or maybe a combination.

With belt ranks it’s easier to see the beginning and end of each plain but with the other, it’s somewhere lost in the plains. There is always a path of some kind but less defined.

It’s not a good or bad thing, just is.