I would make several changes.
1) I would create a goup of HD veterans as "elders". They would have the responsibility of testing any changes, communicating with HD senior staff their recommendations, along with helping decide what changes were to be made. This is the most under-appreciated and under-utilized of WIS' assets. Instead of doing my best to ignore this asset, I would utilize it in an organized and directed way.
2) I would restore reward points, based on participation level of specific worlds.
3) I would create a complete user guide, updated with any change. The user guide would not be based on users' assumptions of facts, but would be factual, based on the engine. For example, pointers such as "When running a triangle, the center requires less SPD (than in other offenses) to score, but requires more LP." and "Setting a guard to -1 will create more FTs than 0, especially if the player has high IQ, BH, SPD, and ATH." Tons of stuff like that, well organized in a readable format.
4) I would redesign HD, to make it much deeper, and much more like RL (where RL additions would ADD to customer satisfaction).
5) I would make it much easier to do certain mundane tasks (examples - sending mass calls to recruits, keeping track of info learned re: recruits, achievement of ratings potentials, etc.)
6) I would rid the game of the campy/repetitive communication. All communication would become factual only. For example, instead of getting a recruit response of, "I really enjoyed the home visit. You really impressed my father", such communication would simply be captured within a recruit summary page under "# HVs accepted / # HVs rejected". In short, less words, and more easy-to-understand meaning.
7) I would task all vets with marketing the game, giving generous reward points for high world participation levels (already mentioned) and effective incentives for bringing new users, with incentives based on loyalty of those new users.
I'm sure there are others, but this is off the top of my head.