The objective of investing is to buy a good fundamental product at a good low price and hold or sell in the high.
Investing is not continuously buying a product as the price goes up, or worst as price come down.
Dollar-Cost averaging is an insurance agent way of selling you a product, it's not investing. It benefits the insurance agent and insurance company, but it does not benefit clients.
If you really want to invest, learn how to identify good fundamental counters in a good low price and buy them.