When you are trying different solutions you are trying them in a specific order based on your intuition of which solution has more probability to solve the issu

When you are trying different solutions you are trying them in a specific order based on your intuition of which solution has more probability to solve the issue. If your last solution worked that means the analysis by which you decided the probabilities of the possible solution was completely incorrect. When that happens you should not just move on rather you should think about why this was the case, what were those heuristics that you used to figure out most probable solution and how they were wrong. This introspection will allow you to evolve your heuristics over time and will give you better idea about which solutions are more probable to solve the issue.