Agree that the boxes on top of the kitchen units need to go.Top of the unit by the dining table, too.
Apart from that there aren't really any glaring issues.
How do you feel about a bit of short term staging?
People are largely unimaginative. if you show them a white box with beige and brown furniture, not all can imagine the place any different.
I'd be tempted to pop the big sofa and the art works in the garage or a unit and replace them with smaller pieces to make rooms look bigger. Pops of colour around the house would also make a difference. Cushions and flowers and rugs.
Can you borrow some comfier looking garden furniture from anyone? Or buy a little barbecue set? Make it look like you're having a good time on the patio of a weekend?
It's part playing the game but mostly just waiting for the right one, isn't it?
I hope you get a buyer soon, OP.