I'm not a professional financial consultant, but I can give you some advice. It is a common strategy to choose index funds when making fixed investment in funds. The following are some index funds that can be purchased at ABC for reference, but please note that the market is risky and investment needs to be cautious. Before making an investment decision, please be sure to conduct sufficient research and consult a professional investment consultant.

1. CSI 3 index funds: such as Harvest CSI 3ETF Linked Fund (1676) and E Fund CSI 3ETF Linked Fund (112). These funds track the Shanghai and Shenzhen 3 Index, reflecting the overall trend of the A-share market.

2. CSI 5 index funds: such as Southern CSI 5ETF Linked Fund (16119) and Guangfa CSI 5ETF Linked Fund (162711). These funds track the CSI 5 Index, representing the performance of a number of small and medium-sized companies in China A-share market.

3. GEM index funds: such as E Fund's GEM ETF Linked Fund (1126) and Southern GEM ETF Linked Fund (2656). These funds track the growth enterprise market index, which reflects the overall trend of the growth enterprise market, including more technology and innovative enterprises.

4. Industry index funds: If you have a deep understanding of an industry and are optimistic about its prospects, you can also consider investing in industry index funds, such as consumption, medicine, science and technology, new energy, etc.

Please pay attention to the following points when making a fixed investment in the fund:

1. Set a reasonable investment target and term. Choose the right funds and products according to your risk tolerance and investment objectives.

2. diversify your investment. Reduce the risk of single investment by investing in different funds and products.

3. Long-term investment. The fixed investment of the fund requires patience and perseverance, so as to avoid changing the investment strategy easily due to short-term market fluctuations.

4. Check regularly. Check the performance of the portfolio regularly and make adjustments according to market changes and your own needs.

finally, once again, investment is risky. Before making an investment decision, please be sure to conduct sufficient research and consult a professional investment consultant.