Many professional home stagers will come in and help you make the most of what you already have, perhaps add something, and probably take a lot away. Of course, this might be a little inconvenient but hopefully it will just be for the short term and your home will sell quickly. The typical stages in this process would include an initial visit from the home stager to assess your home; second, they may come to declutter it for you (or you can do this yourself), and store some of your belongings off site; they will then reorganize what you have left in your home in the way of furniture and decorations to optimize it for sale.
Some additional work might be recommended too, and typically this would involve touch-ups like some landscaping on the garden or fresh paint on the walls. These relatively cheap changes can make a big difference to how your home looks to a potential buyer, and could improve the price you get for your property or even make the difference between a sale or no sale.