There are several synonyms for the phrase "made a mint," which means to earn a significant amount of money. One alternative is "raked in the dough," which implies a large sum of cash. Another is "struck gold," which suggests a stroke of luck or good fortune in finding a valuable treasure. "Hit the jackpot" is another synonym, which often applies to gambling winnings or sudden windfalls. "Cleaned up" and "made a killing" both convey a sense of unexpected financial success. Finally, "brought in the big bucks" indicates a consistent record of high earnings over time. All of these expressions convey a sense of financial gain and accomplishment.