“Learn from the mistakes of others. You can't live long enough to make them all yourself.” ― Eleanor Roosevelt
This statement holds true even in case of UPSC. The better rephrase for UPSC is you can't make all the strategy by yourself and try in exam, so you have to learn the strategy from the previous year toppers. Since the attempts in UPSC is limited, you can't try everything directly in Exam. You should see the toppers strategy and finds out what suits your strategy best. You have to realize that every individual is different, everyone journey is unique and so are their strategy. One strategy can work for someone in their first attempt itself and for some it never works. So the first key thing is analyzing yourself and finds out what will suit you. Here are some of the topper's video available who have explained their strategy for you. Extract the best for you!