First of all, you should try to know everything whether big or small that makes your wife happy. Make sure you do not annoy her by making small mistakes which can be avoided easily.
You should give priority to all those small things that your wife want you to do. She will definitely become happy when you anticipate things she wants and do accordingly.
If your life is outgoing, then try your best to give her surprises by announcing a sudden outing plan or a dinner in a nearby restaurant. It will make her excited and she will become very happy.
You should observe the changing behaviour of your wife as well. You should behave accordingly which will ensure her that you understand what she wants which will make her really happy and satisfied.
Always keep showing your love and care for her and never miss any chance to bring her gifts which will make her proud of you. It will make your relationship strong and smooth.