I like your therapists idea to ditch the Tupperware. The only functional solution I have found for myself? Get rid of stuff. As much stuff as possible. I have spent a couple years purging and purging again. It helps me because the less stuff there is, the easier it is to ensure that everything has a specific place where it belongs — which, for me, is a key or staying organized. Plus the fewer dishes I own, the more frequently I HAVE to wash them and put them away. Same with clothes. Finally no more piles of clothes all over! I have to do laundry every week because I adopted a capsule wardrobe.
I hope you find some things that work! I know it’s hard to let go of stuff sometimes )”what if I need it down the road?” “It has sentimental reasons I need to keep it”) but it’s a lot easier to organize when there’s less if it 🙂