Don't sell yourself short
不要妄自菲薄，不要小看自己
释义：
sell someone / something short to not consider someone or something to be as valuable or good as he, she, or it deserves 不要小看或看轻某人/某物
例句：
Don't sell yourself short - you've got the skills and the experience.
Selling their fans short in such a shabby way is not acceptable.
