“超过自己原来水平”可以翻译为 “surpass one's previous level” 或 “go beyond one's former standard” 。
“surpass one's previous level” 中，“surpass” 强调超越、胜过的意思，“previous level” 指之前或原来的水平，整体表达简洁明了。
“go beyond one's former standard” 里，“go beyond” 有超出、超越之意，“former standard” 表示以前的标准或水平，这种表达也比较自然流畅。