Wow… advice all over the place from folks.
most of it garbage.
lucky for you I also own a project dac box s2+ and a pass amp (not their integrated amp).
first, I got the ifi elite power supply for the project dac.
this made a huge difference.
you have a good dac that with the ifi power supply will compete with dacs in the <$2000 range. I have done this with compare with the qutest and the Pontus and the dac box with the ifi elite power supply and the dac box s2+ is still in my system.
the other area is your speaker cables and other cables. Your cables are well below the capability of your system.
do not replace your integrated amp as someone suggested, you have a very nice integrated amp.
so better cables and and the ifi elite power supply for is what I recommend to take your sound reproduction to the next level.