Do you have any special skills like maybe programming or you speak multiple languages fluently? There are plenty of jobs you can do online but you should tell us a bit more about yourself to give a good recommendation here on the forum.

The only real free way to get bitcoins would be doing some faucets, but the payoff is so low and you need to factor in your time and internet/electricity costs that it's most of the time not worth it.

Maybe look into doing some online surveys? They are usually being paid for a small amount.