You know that one of my specialties is Hoarding Disorder. I find myself recommending the same books over and over again. These books and websites and organizations have quality information. Maybe it will mesh with you, maybe something else is a better choice. Give them a try and see what is helpful for you.
“Stuff: Compulsive Hoarding and the Meaning of Things” Randy O. Frost, Gail Steketee
“The Life-Changing Magic of Tidying Up: The Japanese Art of Decluttering and Organizing,” Marie Kondo
“Daring Greatly,” Brene Brown
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Hoarding/Cluttering Support Group on Facebook is very supportive and positive.