Unless you want to retire with your present company you will at some point have to move on. The questions are: how desperate you are to move? How soon do you want to move? Where do you see yourself going? What is plan B should your first options fail.
Once you have answered the above you need to look at what these companies you wish to go to under plan A and B are actualy wanting from aplicants. Then tailor your career to meet the requirements.
My opinion is that nobody gives a s*@* about Q400 command time and that the jet time would be of more value (so long as you wish to move) Also 195 is more than 50,000kg MTOW. This would make you far more marketable than Command Q4.
Command Q4 will only be useful to other TP operators and your present company.