oneself, yourself

I do my own work myself.

私は自分の仕事を自分でします

I do my own work myself to build a sense of responsibility.

私は責任感を養うため自分の仕事を自分でします

I do my own work myself at the company to build a sense of responsibility.

私は責任感を養うため会社で自分の仕事を自分でします

I do my own work myself at the company every day to build a sense of responsibility.

私は責任感を養うため会社で毎日自分の仕事を自分でします

I do my own work myself at the company every day without anyone's help to build a sense of responsibility.

私は責任感を養うため会社で毎日ほかの人の助けを借りず自分の仕事を自分でします