The altcoin would have a clear and practical real-world use case that solves a significant problem or meets a pressing need. Whether it's in finance, supply chain, healthcare, or any other industry, the technology would address real-world challenges effectively. In summary, my ideal altcoin in 2023 would be a highly scalable, privacy-focused, and interoperable cryptocurrency with a clear real-world use case. It would prioritize sustainability, decentralization, security, and user-friendliness while fostering a strong and engaged community.