New cables now won’t fix any warts upstream in any case, and because they are entirely system dependent, they would be deferred to a near last thing I would consider to change.
Your source might be a big question mark IMO. If I remember your model correctly, it’s an old unit and digital has greatly improved and expanded past simple 16/44 redbook.
First, your digital streaming with only crummy mp3 quality tunes from Spotify ( mp3 is crummy compressed, rolled-off top-end end and chopped wooly chuffy bass) can be greatly improved by a large streaming source upgrade to 24/96 hi-Rez streaming on TIDAL.
Second, using a Mac as a digital streaming source requires a quality build external DAC worthy of your quality build amp and speakers. Don’t chintz it here . Adding a current quality build external upgraded kit to the cdp (now only a transport) and contemporaneously from your Mac should be assessed against your current rig as a first key step IMO.
Do do you have proper dedicated power lines -- a separate one each for source and amp -- installed yet? This will be the biggest cable first step upgrade along with a good quality build power cable.
New Amp break-in period : you may have to endure a lengthy break-in period on your new amp. I waited 450+ hours on my new high-end amp and cdp/DAC before any approximation of a proper break-in period arrived , that ONLY THEN permitted me to properly assess their audio sonic performance and consider any new cable changes.
Your AP speakers are still fine gear. Because every piece has its own bespoke sonic signature , and with the new kit break-in period still in its embryonic stages ..... regrettably you need more patience before you swap in ANY new speakers with a new amp and other potential changes.
Your listening arena warts and potential tweaks
Important yes, but possible tweaks considered only as a very last option after all the above are addressed first.
In summary.
this is a complex alchemy so Don’t sweat the petty things and don’t pet the sweaty things. One step st a time .... this is a lengthy journey to OZ with no quick fix destination option