Advice from members

I have just started putting my first system together and have been enjoying it for about 6 months or so and am starting to research what I should upgrade in the current system next. I am looking to improve both clarity and soundstage. This is what I am currently running, the biggest and most noticable difference to date has come with the introduction of room correction via the Dspeaker Dual Core. Here is the current setup. I am debating on simplifying by going to a all in one solution like a Anthem STR integrated OR introducing a higher quality DAC into the current system:

• Source: Innuos Music Server (MINI MK2) running Roon server and being used as a player
  
• DAC/Preamp/Room Correction - Antimode Dual Core. - To leverage the best input on the dual core I am using a Musical Fidelity VLINK USB to SPDIF (24/96) converter
  
• AMP - Using a Jolida 1501P Hybrid AMP
  
• Speakers - ELAC Unifi UF5 Floor Standing with a ORB Audio 200 watt Sub that is corrected via the Dual Core.
  

I am wondering what the weakest link the chain is and the one I should look at upgrading next.
Many thanks in advance, looking forward to everyones feedback.