The cryptocurrency market has been in a state of turmoil in recent weeks, with Bitcoin (BTC) and other altcoins losing significant value. BTC, which had been on a recovery trajectory after a sharp decline in early 2023, has fallen back below $30,000. This has left investors and enthusiasts concerned about the future of the cryptocurrency.The sell-off in BTC has been accompanied by a decline in other altcoins, with some losing even more value than BTC. Ethereum (ETH) and Solana (SOL) have both lost over 50% of their value in the past month. This has led to concerns that the altcoin market may be in a bubble that is about to burst.However, there are some altcoins that may have overcorrected or crashed unjustly. These altcoins have strong fundamentals and are likely to recover in the long term. Some of these altcoins include Cardano (ADA), Avalanche (AVAX), and Terra (LUNA).Cardano is a proof-of-stake blockchain platform that is designed to be more scalable and efficient than Bitcoin. It has a strong development team and a growing community. Avalanche is a scalable and secure blockchain platform that is designed to support a wide variety of applications. It has a fast transaction speed and low fees. Terra is a stablecoin platform that is designed to maintain a stable price. It has a strong backing from the Luna Foundation Guard.The current turmoil in the crypto market is a reminder of the volatility of this asset class. However, it is also an opportunity to buy into strong altcoins at a discount. Investors who are bullish on the long-term prospects of cryptocurrency should consider adding these altcoins to their portfolios.The future of Bitcoin and the altcoin market is uncertain. However, the long-term fundamentals of cryptocurrency remain strong. Investors who are willing to take on the risk should consider investing in this asset class.Here are some other altcoins that could be considered undervalued at the current time:Polkadot (DOT): A multi-chain platform that is designed to connect different blockchains.Cosmos (ATOM): A decentralized network of independent blockchains.Algorand (ALGO): A scalable and secure blockchain platform.Investors should do their own research before investing in any cryptocurrency.