If your investment portfolio is under $1,000, here are some strategies and tips to consider:

1. **Diversification**: While it may be challenging to diversify with a small amount, consider low-cost index funds or ETFs that provide exposure to a broad market. This can help spread risk.

2. **Robo-Advisors**: Consider using a robo-advisor, which can help you invest your money in a diversified portfolio based on your risk tolerance and investment goals, often with low fees.

3. **Fractional Shares**: Some brokerages allow you to buy fractional shares of stocks, enabling you to invest in high-priced stocks without needing to buy a whole share.

4. **High-Interest Savings Accounts**: If you're not ready to invest in the stock market, consider putting your money in a high-yield savings account to earn some interest while you decide on your investment strategy.

5. **Invest in Yourself**: Consider using some of that money for educational resources, courses, or books that can enhance your skills or knowledge, potentially leading to higher income in the future.

6. **Low-Cost ETFs or Mutual Funds**: Look for low-cost ETFs or mutual funds that have low expense ratios, which can help maximize your returns over time.

7. **Dollar-Cost Averaging**: If you plan to add to your portfolio over time, consider dollar-cost averaging, which involves investing a fixed amount regularly, regardless of market conditions.

8. **Emergency Fund**: Ensure you have some savings set aside for emergencies before investing. This can prevent you from needing to sell investments at a loss in case of unexpected expenses.

9. **Research and Stay Informed**: Stay updated on market trends and investment opportunities. Knowledge can help you make informed decisions.

10. **Set Clear Goals**: Define your investment goals, whether it's saving for retirement, a major purchase, or building wealth. This will guide your investment choices.

Remember, investing always carries risks, and it's important to do your research and consider your financial situation before making investment decisions.