Regarding D1 lax programs, I think Title 9 forced many colleges to drop Men's lacrosse. So, starting with the following schools, lacrosse simply needs to recapture schools who dropped lacrosse!!:

Boston College, Michigan State, Gannon University, Morgan State, UConn, UNH, Butler, Radford, William & Mary, NC State, Bowling Green, William & Mary, etc.

Youth programs like Edge lacrosse simply need to be met head on by tourney directors who refuse their registration unless they play in their proper age group. It's really that simple.