Christy's place full of stuff like this. We needed to organize what items we want to sell first, before costing to sell. We sorted and organized the item by using clear boxes, but we help to see the items where we store them. Many empty boxes have to be sold for recycle. If you have a spare, spare room, use one of your rooms in which furniture can be stored. If you don't have a room, just take a photo and make a list of what we did at home just as messy like this.
If so, just organize it. Then select which items to sell. If you feel overwhelmed, find your dream home photo. sit and relax. Then imagine how your life would change after you had a dream home life. Before Please keep in mind, you need to have a growth mindset rather than a fixed mindset that will block positive reaction.
Let's clean up your space. I would suggest selling the bulky stuff first. After you see the clear space, you can be motivated to go