Going for short term investment into Bitcoin is not really a good strategy and it sounds more like gambling and trading also. Bitcoin investment is for the future like hodling for a longer period of time like between 4-10 years or more and not to sell out your hodling in 1 or 2 years because it's just same thing as trading and can be misleading.
And then there is need timing the market that's why is good to use the best strategy to accumulate more Bitcoin by using the DCA strategy which helps you purchase Bitcoin at different interval at a fix time probably weekly or monthly so you won't have a high blood pressure by timing the market.
Especially new investors hope to invest in short term to get more profit. Actually those who have enough knowledge about bitcoin never invest in bitcoin short term they invest in long term. While some people expect to invest when the price of Bitcoin falls, it is best to invest in the DCA method rather than waiting for the price of Bitcoin to fall. The most effective way to invest in Bitcoin is to invest in the DCA method. If you don't have enough money then if you can invest in DCA method then your investment will be very big at some point. Investing in bitcoins first you need to decide to hold long term, if you can't hold long term then you won't earn much profit. If you can continue investing with DCA method on weekly or monthly basis for 8-10 years then you will surely become a successful investor.