The Four of Cups represents at least a momentary stability in the social and emotional dimension of one’s life.
Crowley has this to say.
Success or pleasure approaching their end. A stationary period in happiness, which may, or may not, continue. Receiving pleasure or kindness from others, but some discomfort therewith.
I have long associated this card with equanimity. Things come and they go. Whether lack or luxury, we learn to take them as they come.