4. Turn the shelf above into two shelves
The gap between the top shelf and the ceiling is usually 10 to 16 inches, and it is where handbags collapse sideways and boxes go to be forgotten. Adding one horizontal divide fixes the collapse and doubles the count of things you can reach without unstacking.
Two ways to do it. Shelf risers — small standalone frames that sit on the shelf and create a deck above — cost about $12 each, need no fixing, and suit a rental. Or fit a proper second shelf on batten strips screwed to the side walls, which is stronger and neater if you own the place.
Sort what goes up there by frequency, not by size. Top shelf: off-season items, spare bedding, suitcases. Lower of the two: hats, bags, the things you reach for monthly. Anything you need weekly should not be above eye level at all.
Use identical open-front boxes rather than mixed lidded ones. Lids are the enemy of a high shelf — you have to lift a box down to open it, so you stop opening it. Fabric bins with a front cut-out and a label on the end let you pull one out with a finger. Match the box depth to the shelf depth within an inch; a shallow box in a deep cupboard just creates a new dead zone behind it.
Vacuum bags are genuinely useful for duvets and winter coats, with one caveat: do not store down or feather items compressed for more than a season, because the quills break and the loft never fully returns.