SDD direct to Oppo day 1!

So I bought a SDD drive and ripped some music.  I plugged it right into my OPPO 105's (Modwright) USB.  Actually sounds better than I anticipated.  While I'm spending my day ripping CDs I thought I'd ask what would be the "next step" to improve sound quality.  I know there is endless information already on the forum but it's a bit overwhelming.  Servers, renderers, streamers, etc.  I'm not really interested in streaming at this point.  Thanks.