"Personal cultivation" can be referred to as "personal demeanor" or "personal etiquette" in Engpsh.

The concept of personal cultivation originated from Confucianism and is centered on the idea of self-improvement through learning and following moral and ethical principles. The idea is that by improving oneself, one can also positively impact society as a whole.

Examples:

Good personal cultivation is key to making a good impression on others.
Translation: 好的个人修养是给别人留下好印象的关键。

She has excellent personal cultivation, always popte and considerate.
Translation: 她的个人修养很好，总是礼貌和体贴。