As a cryptocurrency expert, I am able to point out some of the promising altcoins for 2024:

1. Ethereum (ETH): Ethereum is one of the most famous altcoins and has the largest market volume after Bitcoin. It is used to build other decentralized applications and smart contracts, which makes it very attractive to developers and investors. With the Ethereum 2.0 update already in development, this platform is expected to increase its scalability and speed, which could lead to an increase in price.

2. Cardano (ADA): Cardano is a blockchain platform known for its strong focus on scientific research and security. It was designed to improve upon the challenges faced by other blockchain platforms, including scalability and speed. Currently, Cardano continues to grow rapidly, and the release of the "Alonzo" protocol could lead to an overall increase in price.

3. Polkadot (DOT): Polkadot is another decentralized blockchain platform that is designed to provide interoperability between different blockchains. This approach to blockchain development could prove very attractive to developers and users, which could lead to an increase in the price of DOT