One of my former companies that had both jets and TPs had a career progression of TP F/O, Jet F/O, T/P Cpt, Jet Cpt. At the Jet F/O stage it was about half that decided to opt for the command at TPs, and half that stayed as jet F/O until (seniority based) jet commands came up.
With 2300 jet time, I'm guessing your not too far away from jet command time (3-4000 hours TT?).
With a Q400 command, thats about as far as you'll get without a new type, with a A319 rating, you colud progress to a command and advancve your career further.
As a guide have a look at Flight International jobs - what's in more demand, Q400 Capts, or A319 F/Os?