PERSONAL GEAR LIST; Your opinion on next best upgrade?

 I purposely didn't want to talk about what I think is weak due to wanting uncolored gear focused opinions. I guess I can say that the system seems to have "plateaued". I am after advice on which piece, if all other things were equal, would be considered the weakest link in the current chain.

Yes, either speakers, room treatments, and/or improving the source material by finding the best masterings.

I think you could get better sounding speakers, not knocking NHT but many, many very good speakers out there...could improve your system.

Thanks.
I should have added a pertinent condition here.
I’d like to spend up to $4000 on the next upgrade. So I suppose the question should have been "given the current gear which link(s) is the next to upgrade with a max budget of 4k?"

Bad, I would like to share another tidbit of info FWIW. I went searching for speakers within 90 miles of my home. I wanted to LISTEN and compare myself. I was advised by a couple of good dealers to bring my own music, to include some music I know very well. While I listen to jazz and acoustical music I had found a couple speakers sounded better with that kind of music, others better with Rock and so on. So I learned it’s not that there are really good speakers or terrible ones, it is moreso what you like for the kind of music you enjoy. I settled on Magnepan for one system and Vandersteen for my higher end system. I made sure to match the speakers to the capability of the amp, running tubes with the Vandy and SS with the Maggies.