The recent decline in the value of altcoins and Bitcoin can be attributed to several main reasons:

1. **Regulatory pressures**: Regulatory restrictions on cryptocurrencies are increasing around the world, especially in the United States and Europe. Governments are strengthening legal frameworks to control cryptocurrency trading and prevent illegal activities associated with them, which is creating a state of anxiety among investors.

2. **Volatile global economic performance**: Global financial markets have generally been affected by economic tensions, including inflation concerns and rising interest rates, which has made investors more cautious about investing in high-risk digital assets.

3. **Natural market correction**: Bitcoin and altcoins have seen rapid increases in a short period, leading to what is known as a “market correction” phenomenon, where the price declines after a period of significant increases to restore the natural balance between supply and demand.

4. **Concerns about exchange-traded funds**: Despite the approval of Bitcoin-linked investment funds, there are concerns that they may create additional volatility in the market rather than stability.

All of these factors combined have led to the decline in cryptocurrency prices in recent months.