The main thing is to

Begin to cultivate a sense of wonder.  As a child you had this.  The way to greater awareness (happiness) is  through the active reawakening of this sense of wondrous amazement.   With an attitude of playful curiosity and acceptance you may begin to allow what is, to just be.  A useful tool is to start deliberately unnaming things.  Look at anything and pretend you don’t know what is it.  It immediately becomes more interesting and you may begin to notice that what we name things is not what they really are.  Everything is much more than the name we refer to it by.  Just notice this and allow it.