Drawer dividers to help segment off sections. The limit of what we keep is the boundary of each section. Invested in built-in drawers, shelves & limited hanging space in our main closet. Also a boundary of what we can hold onto/acquire. Tip: in place of nighstands, we use small 3-drawer chests. Keeps the tops clear of "stuff" and lets us store things frequently used.
Pop-It Heavy Duty racks lined up side-by-side like library shelves (short end along the wall, not the long end along the wall) with weathertight totes for seasonal decor, pet supplies and emergency/storm supplies in the garage. More storage than we could ever fill & are slowly weeding through what we truly want to keep with each holiday.
Also invested in built-in window seats in two rooms for drawer storage. In the bedroom, for medical equipment, towels & bed linens. In the living room/dining room for table linens and blankets.
In your pantry, take a look at the depth of your shelves. Most pantry shelves around here are builder-grade, standard 12" deep. Re-did ours to 18" deep. We currently use multi-purpose bins for pantry storage (boundaries of what we can buy) for each cateogry -- breakfasts, grains, snacks, canned goods, etc. We also use multi-purpose bins in our freezer.