The sentence '别太放肆没什么用' in Chinese means that one should not be too reckless or extravagant because it serves no purpose. In English, it is translated as 'Don't be too wild, it's useless.' The word-for-word translation may not convey the exact meaning, but the English phrase accurately captures the intended message.
The phrase serves as a reminder to exercise restraint and not engage in excessive or unnecessary behavior. It implies that acting wild or without purpose does not lead to any meaningful results. Instead, it is better to be disciplined and focus on actions that have a clear purpose or benefit.