phrasal-verb
build upon yourself
すでに持っているものに基づいて、自分のスキル、知識、または性格を向上させること
Meaning
to improve or develop your skills, knowledge, or character based on what you already have
Example
You should always try to **build upon yourself** and become a better version of who you were yesterday.
あなたは常に自分を向上させ、昨日の自分よりも良いバージョンになろうと努力するべきです。