Many people complain about the lack of space to store their things

Perhaps something like this?

https://apps.apple.com/us/app/public-storage/id1537135259

Yes, we have to pair old people with bigger homes in the outskirts with people in the city center which need to store a few boxes all year round!

and it seems that there is still no solution to help with this

Isn't everything already virtualized? Books, encyclopedias, movies, music; you can even recreate your living room/office setup in VR (which apparently works well enough for some people). What's left?

There are many preexisting services and techniques that aim to solve this...

yes, maybe some ideas would help me get started. I don't think a geolocation system incorporated into the application is missing.

put up some shelves