The right time is when you buy it after first doing research and understanding every risk that will be faced if you choose the coin. Waiting for the bottom? you will never know exactly the bottom of the coin
it is true what @Strongkored said, now entering the yearly bearish phase or cycle, if you are a typical long term investor you will know what to do during the bearish phase of the year, this is a golden opportunity.
And the next 4 years with the same bearish cycle as today with definitely different prices, we all know how Btc's track record is, so it's not wrong for us to pay in installments every month by buying BTC. (Dollar Cost Averaging technique) is what I did.
The following are 2 examples of the differences between DCA and Lump Sum Techniques in investing
Dollar Cost Averaging (DCA)
https://i.postimg.cc/RhrhF3p2/Screenshot-2023-01-12-00-54-33-37-40deb401b9ffe8e1df2f1cc5ba480b12.jpgDollar Cost Averaging (DCA) and Lump Sum
https://i.postimg.cc/gjPcpCnW/Screenshot-2023-01-12-00-59-13-38-40deb401b9ffe8e1df2f1cc5ba480b12.jpg