Don't really need luck but contribute to their project.

However, there's something that these kind of article didn't disclose. It's the capital needed to follow an airdrop.
The recent airdrop like treehouse, huma, etc requires you to stake your capital and to get good enough money. Usually at minimum you need 10k USD or something to get 1k - 2k reward.

If you're doing testnet however, consider it already botted that you're more likely to get $5 out of it. In some case you can get really good airdrop like walrus, but that kind of thing comes once in a while.