I am also investing in Rongtong Shenzhen Stock Exchange 100 Fund, and I am also investing in 500 yuan every month, which is regarded as lump sum deposit and withdrawal.
Remember: don't stop the fixed investment when it falls, but stick to it, so that you can reduce the cost. This is the experience I gained in an investment strategy report.
It is recommended to automatically deduct money from the bank card to save worry and trouble. Its trend is close to the deep 100 index (because this index is tracked), just pay attention to the deep 100 index. I hope I can help you!