For investors who already hold altcoins:
Don’t trade frequently, chase the rise and kill the fall. The rising rhythm of each currency is different. Blindly chasing the rise may lead to taking orders at high prices, which is not worth the gain. Stick to long-term holdings and believe that high-quality projects will continue to increase in value over time.

For investors who do not hold altcoins:
Consider investing in the two mainstream currencies, Bitcoin and Ethereum. They have strong liquidity and risk resistance, and are relatively safe investment options. You can also choose some high-quality altcoins for investment, but you need to do a full risk assessment.

Future trends of altcoins:
As the cryptocurrency market develops, altcoins are likely to face increasing competitive pressure. Some high-quality altcoins may emerge from the crowd with opportunities for long-term development. But there are also some altcoins that may gradually disappear, and investors need to choose carefully.

Here are some tips for investing in altcoins:
1. Don’t invest all your money in one project, allocate your assets.
2. Don’t blindly chase highs, but do a good job in risk management.
3. Maintain a good attitude and don’t be controlled by greed and fear.

Here are some factors that may affect the future development of altcoins:
1. Bitcoin price trend
2. Cryptocurrency Market
3. Regulatory policies
4. Market demand for technological innovation

Investors need to pay close attention to these factors and make rational investment decisions.