Newbie want to improve what I have

I am brand new here already purchased my first system. Probably made some mistakes. So I bought an NAD M33, Focal Sopra No 1 speakers, Tellurium Black II cables with an Isotek EVO3 Polaris. I am enjoying the system but realize I've probably made some mistakes. So as a humble novice I'd love some advice where to start to improve my system. I thought perhaps starting with the cables. Looking too warm this up.