Goodluck playing P2E with "free-to-play" features. You can start at zero capital but you'll find out soon enough that most of them aren't really profitable. The game characters or NFTs you minted for free are too weak to compete against players who spent money to level up.
The price of their native tokens are down so you may consider buying them now and build before they start gaining traction again.
That's the reality of it, they offer free to earn but to be able to earn more and beat the other team and players you have to upgrade, this is why its free to earn this is a marketing ploy to entice people to play, experience the games and see it potentials and upgrade to maximize their earning potential, you cannot expect to make a lot of money as a free account, they also make money and they are making money from your upgrade.