Sorry, I’m renovating at the moment so mine is fresh plaster (well, not so much ‘fresh’ now, as ‘still not bloody well painted) with lots of unpacked boxes, it doesn’t scream homely as much as ‘Are you moving again?’ 🙄
I think you things ‘worked better’ at your old place because your sofa had some colour, the toys brought some life into the room, as did the curtains and it had carpet!
I think what you need to do is find something YOU love & build on it. Whether that’s a rug or a ‘thing’ (art, vase, throw,).
That ‘cheap’ flooring is difficult to make homely, but a nice big rug or an unfitted carpet would help. I would probably go for the unfitted carpet as I hate rugs (damn things always move and they’re potential trip hazards) . The floor standing lamp from ikea is cheap but cosy.
Put the shelving/ bookcases up the other way again
DUNELM can be good for cushions.
Curtains. It’s tricky because I hate short curtains, but I don’t want long ones over the radiators - waste of heat, so how about a blind?
Plants - I hate house plants. They’re not compulsory...thankfully.
Your fireplace is so low it definitely needs something above it. TV or A print/canvas
Put the sofa on the window wall a couple of feet forward or the radiator.