Here are some new and promising altcoins across various categories:

*DeFi (Decentralized Finance):*

1. Aave (AAVE) - Lending protocol

2. Compound (COMP) - Lending protocol

3. Uniswap (UNI) - Decentralized exchange

4. Curve (CRV) - Stablecoin exchange

5. SushiSwap (SUSHI) - Decentralized exchange

*Gaming and NFTs:*

1. Axie Infinity (AXS) - Blockchain gaming

2. The Sandbox (SAND) - Virtual reality platform

3. Decentraland (MANA) - Virtual reality platform

4. Chiliz (CHZ) - Blockchain-based sports platform

5. My Neighbor Alice (ALICE) - Blockchain gaming

*Scalability Solutions:*

1. Polkadot (DOT) - Interoperability protocol

2. Solana (SOL) - Fast blockchain platform

3. Cosmos (ATOM) - Scalable blockchain ecosystem

4. Near Protocol (NEAR) - Scalable blockchain platform

5. Kadena (KDA) - Scalable blockchain platform

*Meme Coins:*

1. Pepe (PEPE) - Community-driven meme coin

2. Dogwifhat (WIF) - Meme coin on Solana

3. Bonk (BONK) - Community-driven meme coin

4. Shiba Inu (SHIB) - Meme coin

5. Baby Doge Coin (BABYDOGE) - Meme coin

*Newly Launched:*

1. Aptos (APT) - Scalable blockchain platform

2. Sui (SUI) - Decentralized social media platform

3. Sei (SEI) - Decentralized exchange for trading assets

4. Nodest (NOD) - Decentralized node infrastructure

5. Canto (CANTO) - Decentralized finance platform

Keep in mind:

- Research thoroughly before investing.

- Understand the project's mission, technology, and community.

- Consider market trends, volatility, and potential risks.

- Diversify your portfolio to minimize risk.

Disclaimer: This list is for informational purposes only and should not be considered investment advice.