I am happily married, but I what to save my marriage from ever being boring and unfulfilled.  So, I have to take the correct action to make this happen.  I think the first think I can do is to follow the advice of couples who are happily married.  It is important to seek help and advice outside of your own knowledge.  You do not know everything, so rely on wisdom from people who have it concerning marriage.  You will be surprised at the obstacles you can prevent and overcome by just leaning on understanding from couples that have marriage success.