As Book - The life-changing magic of tidying up.. the Japanese art of decluttering and organizing argues, there are a lot of things we should get rid of, but don't because those things have played a significant role in our past.
If they do not serve as mementos on their own, Marie Kondo recommends a new way of thinking of these things: They served an important purpose in your life, but now they have fulfilled it and can leave your life. Thank them for their service and then discard them.
As Marie Kondo puts it:
The process of assessing how you feel about the things you own, identifying those that have fulfilled their purpose, expressing your gratitude, and bidding them farewell, is really about examining your inner self, a rite of passage to a new life.