I hear you. It is relentless.

I gave myself permission to toss stuff the kids leave out into boxes that I put out in the garage.

I give away whatever they don’t miss for a few months (or years - I get busy.)

I also give them age appropriate help to bring stuff back in - within the bounds of protecting our shared sanity. They’re not allowed to just cart it all back in and dump it all back on the floor. But anything they care about, I’ll help them make shelf space for and bring in.