Your problem is not only just change job title

Generally, you cannot use your current employer job experience (5 years) to apply LC, because DOL think it is unfair for people who want to apply the position from outside of your company.
However, there is a workaround, see those information.

Good luck!

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申請人在同一家公司可以申請2份PERM勞工卡嗎？

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