Earn something without using your own money? I’m afraid that’s almost impossible at your current situation already.
Bounty campaigns can be one if you don’t have any money, but it will take time before you can earn. Testnets from new projects can be as well, but most of them aren’t rewarding testnet users unfortunately, or if they will, it will not be worth it. Faucets? Completely gone already or if there is still, it’s not worth the time.

If you want coins for yourself, then you have to buy it, and if you cannot afford to buy it, then you can offer a service and receive payments in bitcoin or in any other cryptocurrency, but to do so you have to be skilled in something, and it is that skill that you are going to offer to users in the community.

That being said, it is also possible to earn coins through airdrops and faucets, but it is not so profitable and you might just be wasting your time for little or nothing.