I've seen quite a few folks change their game to try and break out of a slump, but it just makes them play worse and lengthen their slump.
So an honest evaluation of how you are playing, fix things that need fixing, but bad luck is a part of poker, being able to deal with it is what makes good players over the long run. Don't try and overcome bad luck by playing bad. Do evaluate your competition or current game, the same playstyle won't work in every environment so you need to adapt your playstyle for the circumstances.