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!

1)
学历及工作经验与EB-2

2)
申请人在同一家公司可以申请2份PERM劳工卡吗？

3)
PERM：如何利用现雇主的工作经验满足第二优先