Yes the trading strategy should be changed every time. So if you have a specific strategy, the probability of loss is 100%. You need to change your strategy as time goes on. This huge amount of market analysis and regular stay up to date with the latest news. You have to constantly serve the market with new strategies. Then I think it is possible to do well in trading.
at first we have to be disciplined towards the analysis that has been made, but sometimes we have to be conditional to see the market that is happening. therefore trading intuition is also needed, and it can be obtained by always increasing our flying hours in trading
I am not against the use of intuition as it is known that humans can take decisions in a split of a second with more accuracy than even computers which are calculating many factors during that time, the problem is that many people only use intuition and they do so when they are newbies, intuition develops over the years and as you get experience, so it is my opinion that a newbie trader should rely 100% on their strategy while an experimented trader can make use of some of his intuition from time to time.
Good point as a beginner it's a good practice to work with your own strategy, you will learn a lot if you seek for deeper knowledge even those losing position will have a good value to keep improving your skills, along the way you'll be able to established good patterns that will allow you to have a better chances of making a winning trade.
Changes from each strategy depends from the situation. Adjustment can be done to follow the concept of making good system to continue
moving upwards and create more working strategy.