justanidea

The Rav needs to start speaking about it weekly in a drasha format of the importance of the topic.

Then the rav gets a group of important members to be maskim to a list of rules that the tzibur agrees to as a zechus to the tzibur or someone in the shul or community who can use a zechus.

Then signs are posted all over the shul of the takanas that the core members agree to on behalf of the kehilla, it doesn’t have to be just for tznius it can be takanas for anything like Speaking during davening or krias hatorah or anything else.

But that should work over time.Now remember most important is the rav giving weekly drashas about that inyans importance!