Even when trying to implement new strategies, it's way better to actually continue with that which you know and has been working for you while you make gradual and slight implementation of that which you intend trying out at the moment and then later you could gradually implement the new strategy and then get going wit it if it's working well enough.
That's correct; trying out new strategies does not mean that the person should abandon the old strategy that he has been making use of, but rather they are just to try out new options that are out there, and even when they have known how that works, they could either combine the two together or be interchanging them based on the occasion that requires each of those strategies and the type of game they want to play at that point.
Trying out new strategy is always a must because sometimes you get weared out because of the poor results you might be possibly getting from the old tactics but that doesn't mean even the new one will still guarantee progress the way you will presume it to be that's why mixing both or rotation of strategy to get the results you want is probably the best when playing or gambling.