The phrase "ups and downs" is commonly used to describe the cyclical nature of life with its highs and lows. However, there are a variety of synonyms that can be used to convey the same idea. These include "peaks and valleys," "ebbs and flows," "twists and turns," "rollercoaster ride," "win some, lose some," "joys and sorrows," "pros and cons," "brights and darks," "good times and bad," and "victory and defeat." Each of these synonyms offers a unique way to describe the unpredictability of life, and can be used to add color and richness to your writing.