Upgrading from soundbar

I currently have a Sony 2.1 soundbar in my living room. What is the best pathway to bring a better-quality sound to my living room using bookshelf speakers? I realize that I won’t achieve the quality of sound I get from the system in my man cave: a custom EL-34 tube amp, passive preamp, and Tekton Lore Reference speakers---but I am looking for an appreciable increase in performance at a reasonable cost. I would like to maintain Bluetooth and possibly a streaming option---pretty basic. Thanks for your suggestions.