Take a look at other threads in Other Languages section. In some of them there are dozens of active members writing hundreds of posts per month, and yet they are still waiting for their own local board, while you don't meet either of those two requirements, at least not yet.

The same thing was with my local board (Croatian); we also had only one thread and we got our own local board after forum staff  got convinced that there is enough interest and a real need for our own local board. And same thing happened for every other local board as that's how it works; first you have to show that there is a real need for your own local board, and then go for it and not the other way around.

Even then, it will take some time (probably years) before you get your own local board as those in charge don't wanna make new board just to die out in a year or two, like it happened with quite a few boards already so they want to be absolutely sure that it makes sense to make a new one.

Just my 2 cents anyway, as I am not the one who decides on the matter.