How should a Muslim react in blessings and tribulations?

Your blessings are to serve the people of tribulation.

If you are in a good situation, God will send the people of tribulation to you and if you reject them and close the door on them, He will make you the people of tribulation.

Allah (SWT) says us in the Qur’an:

“And [remember] when your Lord proclaimed, ‘If you are grateful, I will surely increase you [in favor]; but if you deny, indeed, My punishment is severe.’ “ (14:7)

From the Hadith we learn that there are only two types of people: people in tribulation and people in good situations.

When you are in tribulation, the response is patience, and when you are in a good situation, the response should be with gratitude.

For more details, check this two minute video by Sheikh Hamza Yusuf.