I have mentioned this before - I have 2 add boys and I actually think you did a good thing because fewer choices can help kids focus. Having too many toys can be overwhelming to the point of not being able to enjoy them. Maybe he'll like having just a few things. Less distractions.
As for room cleaning - we label everything - every shelf, draw, bin - so they can put things in the right place easily.
Hi again Pam,
Please know that I wasn't criticizing what you did and I think Cindy's comment above has a LOT of truth in it. Every kid is different, every case of ADHD is different & every situation is different. You truly know your son best!
I've learned so much the many wise people who post here so I'm passing along things I've tried that worked from my son, in my situation. For our family, it lessened a lot of the frustration (on all sides!) if I viewed things thru a different set of lenses, so to speak.
Parenting is never easy (unless you're doing it wrong!!

) and I feel for you, juggling all you do as a single parent.
I don't believe in doing children's work for them--that's not to their benefit & it only teaches them to quit. I do believe in helping them to help themselves & that includes teaching them to say, "I don't know what that means exactly" or "I want to do this, but I'm not sure where to start."
If your son needs help finding things to keep him occupied, the 2 of you can sit down and make a list of 10 things to for him to do and post it to your fridge at his eye level. Then, he'll know to look there for ideas first when he's bored or lonely. Have him add to the list as he comes up w/ ideas of his own.
When my son was around that age, I would let him "cook." I'd put small amounts of a bunch of harmless inexpensive ingredients in mixing cups (dried rice, dried pasta, dried cereal, some water, etc.) and let him pour them into a large bowl & stir. He loved this! He felt important--like he was doing adult work. Soon, he graduated to really cooking his own pasta, toasting his own bagel & making his own pizza (from dough to oven!) So, play skills he learns now can reap big rewards down the road AND give him confidence in his abilities.
I'm sure you have MANY great ideas of your own! Me--I could never think of any on the spot so I had do it ahead of time so I'd be prepared for the inevitable, "What can I do? I'm bored."
Good luck!