Have you tried the KonMari method?
I would recommend Mari Kondo's book, The Life Changing Magic of Tidying Up
, but you don't need another book in your house
Fortunately, her method is so popular, there are plenty of you tube videos and web articles about it. Just search the web for KonMari.
One of her suggestions which is oddly helpful for discarding things is to acknowledge the role an item played in your life, and thank it for its service to you. Weird, but I got rid of some inherited stuff I truly had no need for by acknowledging how the item helped my Mom, recognizing that it couldn't help me the same way, and thanking God for the item's service. (Saying thank you to a piece of embroidery was a road too far for me, but maybe you should try it.
If you are keeping mementos of loved ones, it helps to be selective about what you will keep, and acknowledge that leaving it in the attic in a plastic bin is not what a memento is for.
Good luck! You're not the only one struggling!
He that loveth silver shall not be satisfied with silver; nor he that loveth abundance with increase: this is also vanity.