How to act like you give a **** about your job?

you better change your attitude especially if you like to eat and you need this money to buy food

Show up on time, help out coworkers, ask for feedback, offer ideas for improving the company

Actually give a **** about your job.

Do it good. That’s all they can ask of you and ever will.

Do it well.
That way, even if you don't seem to care, people will be impressed by your productivity.

If you like what you do then you don't have to act like you care and it won't seam like work.