When you want to convey the message that something is not necessary or compulsory, you can use the phrase 'not required'. However, there are several other suitable alternatives that you can use to effectively express the same message. One of the most common ways to convey the same message is to use the phrase 'optional'. This word means something that is not mandatory but rather a choice. Another alternative is to use the phrase 'unnecessary', which refers to something that is not needed or needless. Other alternatives include 'superfluous', 'discretionary', and 'non-essential'. By using these alternatives, you can effectively communicate to others that something is not required or necessary.