Method one (Proof of work): you can employ a programmer to make a similar structure as bitcoin. For instance Dogecoin built their own structure with fork of litecoin (litecoin is a fork of bitcoin).
Method two (Proof of stake): Use Ethereum as a base and use the essential tools such as RemixIDE (remix.ethereum.org) , hardhat (hardhat.org). RemixIDE and hardhat are free and open-source tools. Your own new cryptocurrency will be built upon the ERC-20 standard but the Ethereum network gas fee is an unavoidable cost which is a fee you pay to the network validators (The works of Validators are to execute the transaction that deploys your smart contract onto a Blockchain).
Method three (Proof of stake and Proof of History): Use solana as a base to build your own cryptocurrency and the essential tools is Solana Blockchain playground IDE / Solana CLI (Command Line Interface) and Solana SDK . You also need to pay Solana gas fee for validators.
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