Opportunities don't always knock twice, which is why it's important to be ready to act when you "grab the chance". However, if you find yourself constantly repeating the same phrase, it can become stale and lose its impact. Instead, consider some synonyms to add variety to your vocabulary. You could "seize the opportunity" or "take advantage of the moment". "Snap up the chance" or "snatch the opportunity" might also be appropriate. Don't forget simpler options such as "jump at the chance" or "make the most of the opportunity". Each synonym adds its own unique twist to the phrase, and can help you convey your message in a fresh and exciting way.