I had an adult student who read Don Anslett's "Clutter's Last Stand" and found it life-changing. As I remember, the student was an art teacher and often felt overwhelmed by the clutter and disorganization of her house or classroom or studio. She took the book to heart and enthusiastically supported it as a key to greater happiness.
You may have seen Marie Kondo's current book "The Life-changing Magic of Tidying Up" or her series on Netflix. Her books and her Netflix series are getting high praise and attention. You can see quite a bit about her with a Google search or look at her videos on YouTube:
Google:
YouTube:
Only you can tell if you are burdened by the actuality, or maybe the thought, of what's in the basement, or what your grandmother would say about the condition of your closets. One thing Anslett got into my head was that just because I toss the little brown vase that is my symbol of my grandmother does not mean that I didn't love and cherish her. 
The movie "Coco" explains the Mexican-Indian tradition that my soul will be happy as long as someone living remembers me. It's a nice idea but I know I have been worthwhile, whether or not anyone still has pictures of me.
Hoarding, having too much stuff, having to get a larger rental locker just to house stuff are problems that affect many people today. I say "Take lessons, read Kondo or Anslett, hire someone to haul away ⅔ of your stuff and find freedom and a new start."
