Girls' football grows when families can see it. Visibility is the input, participation is the output.
Most clubs try to grow their girls' section by asking existing members to bring friends. It works slowly. The clubs that grow fastest do something simpler: they make the girls' section visible, and let the visibility do the recruiting.
Every part of that loop depends on the first step. A girls' team with no content is invisible to the families who might join it. A girls' team with consistent matchday content is the most visible thing on the club's page.
Keeping a player costs nothing. Recruiting one costs a push. The player of the match card, the goal announcement, the team photo — these are retention tools disguised as content. A player whose moment is celebrated on the club page has a reason to stay.