DS was a 3 time applicant. That, in itself, says a lot about how badly you want to be there. Be sure to add this to your "why" equation. "Because I feel like it's my Destiny", or some version thereof, could work it's way into your answers.
I'm not certain whether your focused on answering the "why" question in essays, or in interviews? Or in both.
Regardless, I suggest you seek out some interviewing counseling, with a professional in the area. Then find someone with Military background, preferably SA if possible, to talk to. And run these questions past them.
In my limited knowledge of the process, I'm still convinced that interviews (and behind the scenes less formal communications) play a bigger part in this than most realize. The Gatekeepers involved are looking for that "something" that makes you stand out. In your case "Perseverance" and how that will make you a better leader and teammate with others ought to be strongly communicated.
Start now on showing improvement in all areas of the WCS concept. Especially in any perceived areas of weakness. Example, if your test scores are reasonably high now, then grades in University level course work similar to Doolie/Plebe level coursework, will probably become more valuable. DS didn't bother to retake SAT third time through this, instead continuing to focus on all A's, and building Military Leadership profile.
Obviously "your results may vary".
Your own intuition should be guidance enough at this point, for where you need to show improvement. Nevertheless, use every possible opportunity to communicate with your AOs and point of contacts at congressional level. Ie: Congressman's SA committee coordinator.
Put your absolute best efforts forward, starting NOW, for the next 8+ critical months.
Anything in the area of community service hours in something outside of your comfort zone, might also make an impact, as well as be a valuable experience. If I were an admissions person, and I heard some kid tell me that they "volunteered" by serving as a peer-to-peer guidance person in their churches youth group, that might be helpful, but Id REALLY wanna hear about the kid who got out in the homeless encampments handing out brown bag lunches, face to face with those less fortunate in life. Get involved with a group of that type. Only my opinion, but find a way to make it Real.
Third time is the Charm!