LOOKING TO IMPROVE THE ACOUSTICS OF MY LISTENING ROOM

I am looking to improve the acoustics of my listening room located in Nassau County, New York. I have installed drapes, an area rug and not sure how to proceed further. Do I need absorption, diffusion, tube traps in corners? Not sure of any of  this. I am looking for someone to come to my music room and help me. I believe I need an acoustic engineer who has the knowledge to show me what objectively needs to be done to meet my goals. Willing to pay a reasonable hourly for advice. Many audiogon members have stated that if the listening room is deficient, changing equipment will not be the final answer.   Thank you.