Take it one space at a time and ask yourself: Does it serve a purpose? Do you use it? Does it bring you joy? If you answered no to any of these questions, let it go. Pare down to the things you really love and need. The rest is just “stuff”.
Assess how you use the space and could use it better. Bookcases are valuable space that are under-utilized. Rather than decorate with trinkets, we added baskets which hold household items. They were just consuming space in a kitchen cabinet, but can be used when hosting get togethers.
I love the way a wardrobe looks in a family room, but it consumes significant space, so it needs to be functional as well. We removed the coat closet in our foyer so in the winter it accommodates coats and in the summer, the same side is filled with throws we’re not using. Drawers hold games, candles, and pillow covers.