Many people with ADHD like to keep their stuff in full view because they find that seeing a thing helps them remember to repair it, return it, remove it, or replace it. Unfortunately, clutter is unattractive and distracting. I wish there were a painless way to get rid of clutter. Alas, it takes a bit of work. But it will go more smoothly if you do things systematically.
To keep stuff out of sight but not out of mind, use labeled, see-through containers, bins, and baskets. Once you fill a container, that’s your cue to go through it and toss what’s not needed.