You can invest, but when the market exceeds 3000 points, the cost of buying a fund will become higher, but when the market is good, the fund will also have better expected returns, but the ability to take profits and stop losses for investors will be improved.

Generally speaking, it is better to buy funds below 3000 points. The cost of buying a fund is lower and the fund share is more. If the fund goes up, the income will be more, so it is more cost-effective to buy the fund below 3000 points.