I'm just a newbie and I don't have other opportunities to make money irl because of my place of living and age. I tried already bounties and airdrops, but I'm not lucky in it. Thanks for your advices!!!
If you are trying to get cryptocurrency without investment, you can try to improve your skills in the field of programming and try your skills in the field of blockchain, cryptocurrency, and various other jobs related to it. Or you can try your luck on this forum by developing your account well and entering a signature that has Bitcoin rewards, that might be your way to get cryptocurrency without the need for investment. It's a little difficult, but you have to try.
You have mentioned some ways that it is possible to get cryptocurrency without investing. Also from this forum many earn crypto through signature campaign as well as bounty, airdrop. Some earn crypto by managing community in various projects, many manage campaigns. Some are doing remote jobs. these do not require money investment but require skill and hard work. which many do not have. Bounty or airdrop doesn't require skill so those who don't have skill can try to earn free crypto income from here.