When it comes to what furniture you should and shouldn't keep, your focus should be on utility above all else. Look around. If there's anything you keep that doesn't serve a functional purpose, let it go. There shouldn't be too many of these items.
Mom always reminded me I could do whatever I wanted, even though she would joke that I was trying to do too much. She seemed to be saying if you want this life you live, it comes with costs as well as all those benefits.
Throughout the country, including in Tokyo, there are local associations of what are often called Goodwill Guides, most typically retired long-time residents who speak some English and welcome an opportunity to use it.