Drop-offs refer to a situation where there is a significant reduction or decline. The antonyms for the word "drop-offs" include upswing, rise, increase, growth, and development. Upswing refers to a significant improvement or recovery from a previous decline, while rise represents an increase in numbers, value, or status. Increase connotes a significant addition or expansion in quantity or size. Growth, on the other hand, implies progressive development or advancement. Development refers to the gradual growth or progress towards a more sophisticated or mature stage. All these antonyms can be used in various contexts to represent a shift from a declining to an upward trend.