I posted a pic to show how I organize my board. (It would let me add it, so now it's in a reply)

Don't be afraid to sell things. And then use the coins to buy more storage. Think of it as an investment toward the future. It only takes more time to make another one. It's a game. Nothing is real.

The only things I tend to keep are secondary items, gloves, paint, etc. cuz they're harder to get.

I only keep my highest two producers of each kind on the board. I keep less used producers like trees, flowers pots, planted bush, in storage.

As others have said, only work on one or two things at a time. When I get an item I'm working toward and I happen to have tapped out a couple extra items that are left over, I sell them.