Living room help

Can anyone help with the layout of my living room, it seems that no matter what I do it never looks right. I have an awquard kind of l shape with 2 doors, bay window and fireplace coving. The wall with the sofa in has a radiator and then the doorway. I can’t afford to change a lot at the moment, but if anyone could suggest a better layout. I had 2 sofas before but one blocked the entry from front porch which was a nightmare so I settled on a chair. I want it to look and feel cosy which it doesn’t at the moment. Any suggestions welcomed.
I am considering getting a corner sofa to go under the bay window and mounting the tv on the wall above the sofa, but worried this would take up the whole room?

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