Appreciate being alive, and realise what a huge privilege it is to be able to see, hear, walk, feel. Never take for granted the blessings of having your health, your loved ones alive, your life. Remain humble knowing it can change at any time and always be grateful for it all.
In your 20s, you will face some of the hardest tests Allah has written for you, it is important to hold on to your faith in Him through it all. Dont lose belief in yourself either. Not every hardship is meant to break you, some are meant to shape you.