Identify the incorrectly used phrase: "The most important things in my life are making money, traveling abroad, and to live well."

The phrase "to live" is incorrectly used in the context of the list provided. In this sentence, there is a parallel structure that begins with gerunds (the -ing form of verbs) for the first two items: "making money" and "traveling abroad." The phrase "to live" introduces an infinitive form, which disrupts the consistency of the grammatical structure within the list. Therefore, to maintain parallelism, all items in the series should use the same grammatical form. A correct version of the list would be "making money, traveling abroad, and living well," which uses gerunds consistently for all elements. This ensures clarity and coherence in the sentence.