I must agree with @fiesta75 that moving the stuff from in between your speakers would likely result in a real improvement. But given the size of your room the biggest gain would be in the preamp. A good preamp is the heart and soul of a system like yours… as well as the phono stage. I would invest in that way before a new amp.
I have been pursuing high end sound for fifty years. I started with very modest components. The first big step up was from owning a great preamp, the second a great phonostage, and finally and amp. It would be easy to overload the sound in that small room and make you think you need more power and bass… you will probably want bass traps in the corners to help stop overloading the space. That lets the contrast of nothing to strong sound increase. Also, after removing the stuff between the speakers a thick wall hanging to absorb sound and one on the wall opposite the speakers should help. Corner traps would prolly help (small).