Sorry, I have to say you are wrong
I do my job is correct grammar-wise
You can say it alone with an intention to say something after,( but you don't have to say it sometimes)
for example
I do my job without anyone's help
or
How I do my job...
^^^^^ here you had to say the rest of the sentence
But if you don't say anything before or after , I do my job will mean
I do my job right/well/honestly




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