As a 4 you are always looking to build the foundation. As a 4, look around you, you are always building, and assessment, how is it serving me and others. Declare it, this is my Mercury year, instead of asking the question, declare it! You are the creator of your reality, you are all the numbers, you can create your own reality. Have a look at the Numerology book by Johari, Harish that lists what your good years are. Be present and enjoy your life. Your twenties are for you to know who you are. You want to experience life so you can gain that wisdom for your later years. Pay attention to where you are and how you are feeling. Self-discovery in your twenties is wonderful so enjoy.
Having a plan allows you to focus, by using the numerology helps you with order which is important, and you are growing in your appropriate phases.