The phrase "chancing on" implies something happening by chance or luck, but there are several antonyms that suggest more deliberate or intentional actions. For instance, words like "planning," "intending," or "purposefully seeking" all suggest a proactive role in what happens next. Additionally, words like "avoiding," "evading," or "eluding" all imply an intentional effort to prevent or stay clear of something. While chance can certainly play a role in our lives, there are often times when deliberate action is necessary to achieve our goals, avoid potential problems, or simply navigate our way through the chaos of everyday life.