There are no categorical antonyms for this term. Monday blues typically refers to a feeling of the sadness or lack of motivation taking place on Monday i.e. the first day of the typical working week.
Here's a list of antonyms for blues.
Opposite of a state of melancholy, sadness, or depression
Opposite of an angry, irritable, or sullen state of mind
(the blues) Opposite of plural for a feeling of unhappiness
“Nelly was filled with happiness and overcome by emotion as Brad read out the wedding vows.”
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