What does TM international and district say specifically to do to retain members?

Does district or TM international have a strategy to use to retain members? (I've only ever heard strategies to attract, recruit and encourage for new members to join)

I ask this because retention is critical for clubs to survive. Its not likely that brand new members are going to be willing or able to take on bigger officer roles. succession planning doesnt seem to be on TM international or district agenda.

I'm not even sure what the key salespitches would be retain members (I can think of it really being the only place where you can practice in front of an audience and get feedback)

meanwhile the reason why I hear people stay is often some new goals to pursue ( which might include taking on some leadership role to focus on growing there) and the other reason: the people at the club make things interesting/fun enough so the attachment to the club is strong.