Advice for upgrading my system

I have been on Audiogon for about 6 months and I enjoy the expertise and reading the conversations. I am hoping to receive guidance to upgrade my 2 channel stereo.

I am now ready to upgrade and I have budgeted $30k to do so.

My current system is the following:

McIntosh MA 6600
McIntosh MP 100 Phono Preamp
Marantz super audio CD Player SA-11S2
Micro SeikiDD-40 Turntable
Denon DL 103D Cartridge
2-Monitor Audio PL - 100 speakers
1-Velodyne HGS12BGII Subwoofer
Sonos for DAC

My room has been acoustically treated in the
walls and ceiling by a company that specializes in this. 

I primarily listen to jazz, classical, and 70’s music.

Room dimensions are:
  ⁃ 30’ 6” long
  ⁃ 14’ 6” Wide for the first 12’ 4“ of the length and then
  ⁃ 10’ 4” Wide for the last 18’ 2” of the length

I consider the main listening area to be the 14’6” x 12’4” section.

I am looking forward to hearing your feedback. Btw, I live in Denver Colorado.