这是我应该做的 英文是什么

It's my job.

This is what I should do.
这是我应该做的。
That's what I should do.
这是我应该做的。
This is all what I should do.
这是我应该做的。
I did that which I ought to do.
我做了我所应该做的事

This is what I should do

祝楼主在新年里万事如意

it is my duty/job.

it's my duty

it's my job.