Traders' approaches to trading strategies definitely vary, it's not always just about one strategy, but they can try several strategies and combine them. Sticking to the same trading strategy over the long term has never been a problem as long as the trader is making a profit, but along the way I think they have also developed the strategy to be more effective.
In fact, most traders have changed their trading strategies based on market conditions. They adjust their trading strategy based on the trend, which is much better considering that the goal of trading is to take advantage of price volatility to gain profits.
You could build yourself a strategy based on the trends, and be ready beforehand. Nobody needs to change their strategy on the fly when the trend changes, that would cause you to lose a lot of time and money. I would say be ready for any kind of trend before hand, like what to do if it goes down a bit, what to do if it goes down medium and what to do if it goes down a lot, versus also what to do same when going up as well. When you do these things then you will eb ready and you are going to do what you already planned out and won't be caught off guard.
A lot of people try to react to the market and make some moves based on what they are seeing, and trying to trade and come up with something right on the spot isn't an easy thing to do, a lot of people will fail because not all of us are trading experts and we are not good enough to do it. Hence, be ready beforehand and you will never have to worry about what to do next and you will make some money that way.