when traders are finding their existing strategies are inefficient then they go fine-tuning it with respect to market's latest conditions but I am seeing really they are switching over to new strategy.
That must be true. Professional traders are learning and testing new strategies more often but rarely do abandon their longer used strategies. It means they are slow on adopting new strategies because they will take more time to test and evaluate the effectiveness of one new strategy and once find a strategy is useful then they will definitely stop using it as they keep on improving it by adding extra parameters and conditions to make it more effective for profitable decision making.
Professional traders are having different kind of habits while dealing about strategies and making use of it for decision making. We must need time and experience to slowly learn about those kind of habits.