Actually there are huge lessons JWs could learn from Mormons, Adventists and others that they have not learnt. Which makes me suspect they are not actively engaged with reflecting on such comparisons with a view to strategy.
Mormons and Adventists have much more effective ways of encouraging and soliciting funds and they are much more savvy in their public relations and engagement with state agencies.
JWs actually appear quite naïve in how they approach “strategy” if you can even call it that. Most of the leadership apparently do genuinely believe they are specially called by Jehovah and that Armageddon will come soon. This has inevitable consequences in terms of formulating effective strategy across the board: whether that be weird stop-gap doctrinal innovations such as the “overlapping generation”; complacent and ineffective responses to scandals such as the Australian Royal Commision; or financial naïveté resulting in financial crisis since 2015.