Inventory
What do you love, what do you hate? Are you missing nighstands or an area rug, or have too many miscellaneous chairs? (Guilty)
Edit
Remove the eyesores, keep only what you love and need. Marie Kondo the heck out of your things.
Invest
Prioritize what pieces are most important to you, and budget accordingly. Start with the big pieces that take up the most visual impact and fill in the gaps later.