Preamp upgrade

Hi all. Looking for some Reva or just to be told that it likely doesn’t get much better. Current preamp audio research ls-7 which was an audiogon purchase 12 years ago 550.00. Upgrade consideration ARC ref 3, ARC GSPre, Elliott Studio Arts 66-001, aesthetix Janus, audible illusion 3b, etc. rest of the system is parasound Jc 5 amp. eat c-sharp TT, McIntosh MP100 phono pre bluenode streamer and vandersteen treo carbon ct. audio quest cables throughout. I am wondering if the preamp upgrade for thousands more will provide any real marginal gain. Looking forward to the chat