What do you see as the top one or two or three reasons for the decline and weak culture? First step is to identify the problem.
In our area, it was a group wanting to break away from Little League without getting unanimous buy-in. Population was too small to absorb a split. Took several years to recover.
Of course there is also the perception that everything was going the way of travel ball. In fact, most youth travel organizations work around traditional rec season so it was a matter of education an communication.
Getting the HS program involved with the youth program and vice versa is usually a very good thing. Although it is harder than it seems since both are in full swing largely at the same time around here anyway.