Overall try to stick to an opening even if you loose when playing it and learn from your mistakes, first learn a couple of good ones that fits you the best. I love Caro Kann too. However I suggest from time to time to try out some new opening so your thinking won't be monoton and you can learn new ideas and strategies from other openings too
changing opening or one opening
A lot needs to be considered when it comes to choosing your openings. I have a whole section on openings on my blog that I know will help you.
www.advancedchesstraining.blogspot.com
In the caro kann there are a lot of variations, why not study the sidelines and look for
a line less studied so you can make your secret weapon against opponents who think
they know your game.
Also because of your experience even if they have something
nasty prepared for you, you are probably more knowledgeable about the
middlegames and endgames resulting from your position having played this opening a lot
more then your opponents do.
what is the advice by good players?
I like to play Caro Kann exclusively with black thus become better at playing it I have played the Caro Kann over 5 years now.
I know I may become a sitting duck cause everybody who meets me knows that. But on the other hand I know what to advoid and have my own way to play the Caro Kann.
is it a bad idea to stick to one opening or will you advice me to continue.