I'm fairly confident that peace of mind has very little to do with material success or arranging the world the way one wants it. My brain is like a Manhattan subway train, rattling and crowded, full of multitudinous usually debilitating conversations. I'm convinced that the only way I am going to find peace of mind is by emptying the subway car. I think that was one of the functions of my excess drinking. Intoxication worked. At least it seemed to. Or maybe it just did in the beginning. Not entirely sure. But I do know today that by doing 11th step meditation and just emptying my mind and thinking about nothing does bring me the serenity I thought that material success and world arrangement would bring. For me, this form of meditation replaces inebriation. I'm not sure I like how that sounds, but it seems to be the truth. Perhaps a more digestible way of saying it is meditation leads to the spirituality that keeps me sober.
Try taking a few deep breaths while repeating to yourself, "Empty my brain." See what the effects are. Try to lengthen these meditations day by day.