To be more childlike, you don't have to give up being an adult. The fully integrated person is capable of being both an adult and a child simultaneously. Recapture the childlike feelings of wide-eyed excitement, spontaneous appreciation, cutting loose, and being full of awe and wonder at this magnificent universe.
Softly and kindly remind yourself, I cannot own anything. It is a valuable thought to keep in mind as you struggle to improve your financial picture, worry about investments, and plan how to acquire more and more. It is a universal principle which you are part of. You must release everything when you truly awaken. Are you letting your life go by in frustration and worry over not having enough? If so, relax and remember that you only get what you have for a short period of time. When you awaken you will see the folly of being attached to anything.