This is exactly the problem they had in Japan I remember reading that Japan had this exact problem because all the active managers were in division II.1 and whatever half asleep noob wandered into II.2-4 won it easily.
So sorry that you are in boring leagues but that is a bit of pot luck. In Australia I know that the ABBL and all division II forums are very active. In division III or IV it is a bit of pot luck but it only takes two talkers and others will start to join in.
The other thing is to join an active and non-random private league. My PL has been very quiet this season but we have somewhere between 10-20,000 posts in total, that should be enough to satisfy anyone. Weekly ladders, MVP voting, game writeups, tipping competition, all star teams and just a mountain of arguments about anything. Don't believe me just take a look at the Australian IV.7 league forums (where several of us started).
Another excellent way to get involved is to help out with a national team. You could try with Team USA and if not there are dozens of small nations that would love some help. I know when I coached India and Bolivia I was always very keen for some helpers.