I think you are talking about investing in Bitcoin by buying Bitcoin. If you have knowledge about the basics of Bitcoin and its history, you will understand whether it is safe to buy it or not. And there is no right time to buy Bitcoin. You can buy it at any time using the DCA method. If you buy this way, you will not be affected much by the changes in its price. And if you can hold it for a long time, your average price will improve a lot.