How can one reconcile the Hadith, "There is no harm in wealth for one who fears Allah," with the Hadith concerning the delay of the wealthy in entering Paradise, and what should a Muslim do in this regard?

There is no dispraise of the grateful rich person in the hadiths that mention the poor entering Paradise before the rich. The delayed entry of the rich is not a punishment, but rather an accountability for their wealth. The preference between the rich and the poor is determined by their piety and righteous deeds. There were both rich and poor among the Prophets and the Companions, and some of them combined both states. Allah did not prefer anyone based on poverty or wealth, but rather on "piety" and "righteous deeds." Wealth is preferred if its owner is benevolent and spends in the way of Allah, for that is a door to good deeds that is not available to the poor.