Many people focus on paint and furniture but lighting is often the most powerful upgrade.
Ceiling fixtures set the tone but they should not be the only source. Adding floor lamps or table lamps creates layers that make a space feel warm. Under cabinet lights in the kitchen change how functional it feels.
Dimmer switches are affordable and can instantly change the mood of a room. In bathrooms bright task lighting is key while in bedrooms softer light works better.
Good lighting can even make small spaces look bigger. Natural light matters too so do not block windows with heavy curtains.
Final thought: Lighting is the difference between a dull room and a stunning one. What lighting upgrade would you try first?