I'm a bit of a hoarder, although I DO try and keep it under control.
PArt of it is raw materials for crafting - as I knit, sew and make cards. DD is into art too. And we have loads of books and toys.
But I also recognise the hoarding "gene" in me too. I try to keep things relatively clean and not build up crap-piles. But its a battle.
I tend to do "bulk shops" for groceries - so the space in the kitchen can be confined at times. But I DO try to use up one batch before heading off for another large shop. But I know I also buy certain things that we use when I see them on special, and that I have an in-built "need" to feel that there is plenty there (combination of large family and sometimes very low stocks when I grew up, occasional bad weather meaning we felt very tight, and also being a working mum who also likes to cook loads of different types of food and bake - dealing with last minute school cake sales, or "drat, working late so can't get to shops, need a storecupboard dinner option" panics, are all made possible becuase I have those stocks in).
We got a storage unit while we converted the attic, and retained it (2 years ago now) once the work was done. I have gotten rid of a fair amount that was originally there (lots either dumped or charity shopped, and I have various nieces and nephews who have used lots of DD's smaller clothes and younger toys too). We rotate things too - so as she grows out of things, they go in - while the next age batch of things heads off to a niece.
I have gotten rid of stacks of old papers in the past year. I burnt the receipts from the past 4 years a few weeks back. I have made space in the office/study to work there again in the past month.
But its an ongoing battle.