Paring back your possessions and living with less is most often a slow process. It takes mental adjustment along with the investment of time and energy to let go of things, and a way of life, that you have taken for granted for many years.
One of the things that can help you as you make this adjustment is the principle of keeping like with like. Keeping like with like was instrumental in helping me to finally organise my endless mess. It also made it easier to declutter because I could see just how much of each thing I had.