One of the things I see around some forums, and what I remember from my Amway days is hearing about how someone "made the decision" to go diamond. You cannot "decide" to go diamond anymore than you can decide to win the lottery. You can decide to work hard and you can decide to try and follow all of the recommended advice for achieving in Amway, but you cannot "decide" to go diamond. Going diamond requires you to have certain group structures, which requries sponsoring. Sponsoring others is something that is not directly within your control. Maintaining retention in your group is also something you may not have direct control over.
One familiar theme I recall hearing on WWDB rally tapes is that someone, usually the man of the house, finally made a decision to go diamond. I don't recall a detailed explanation of what that meant. When I was prospected into Amway, my sponsor never could tell me in a straight answer what you actually do as an IBO. All he kept assuring me of was that I could be taught everything I needed to know. Looking back, he was right. In a nutshell, the Amway business is simply this: Buy, sell, and sponsor. But of the three components, the only one an IBO can directly control is to "buy". To sell or to sponsor is something that you have no direct control over. Yes, some people can improve and get better at selling or prospecting, but I believe the vast majority of people, even those who work hard and give effort, simply do not have the skills to overcome the reputation and high prices that apparently stigmatize the Amway business.
As I have stated, you can decide to try Amway. You can decide to buy tools and products, you can decide to work hard and give your best effort. You can decide that this is a good opportunity for you. But you cannot decide that you will go diamond. Many have tried, very few have made it. Even those who attain the apparent pinnacle of success, often find that maintaining the level is a near impossible task. Good luck to you if you "decide" to go for it.