it is not possible to appreciate the good days without the bad days
Every bad day in life helps to boost our mental strength and push us towards improvement. It is not possible to appreciate the good days without the bad days. Just as a seed struggles hard underground to rise and grow into a green plant, to succeed in life one has to go through various hardships.
Sometimes, we may fall on bad days, and get depressed, but those times teach us truly valuable lessons. The bad days give us the opportunity to learn something new, we know how to overcome those adversities, and as a result, when the good days come, they become more joyful for us.
For example, many great entrepreneurs have failed multiple times, but they never give up. The path to success is through their failure. Every bad day in life, every failure is a step towards success.
So, it is necessary to fight for good days in life. Adversity makes us stronger, and when we can overcome those obstacles, that's when we taste the truly good days.