Never stop asking Allah for hidayah. No matter how much knowledge you have or how committed you are to the deen, you will always be in need of His guidance.
Once you realize that anything can happen; sickness, death, lose your job... Literally, anything in the blink of an eye, you become very humble. Tables turn and that's how crazy life can get.
Always stay humble, and be grateful.
Some things won't make sense today, tomorrow, or even years from now. But Allah's wisdom is far beyond our understanding, and that's enough reason to trust His plans.