Tbh, this game takes time and planning. You have to know what you want first and what is acceptable to you long-term. For example, you have to ask are you happy as long as you can play with a certain ninja and ok with losing with them some of the time? If so, you can plan which events you do and how to spend your coupons. You also have to not be tempted to spend coupons on things that will slow you from achieving your goals. For tougher goals, it's ok to spend a little here and there.