Invest as soon as possible if you have extra income. Don't wait until you start, if you can start now, why not. Use cold money if you want to invest in bitcoin, if you think the additional income is sufficient use the DCA method I think it will be very helpful, buy weekly or monthly set aside your money, slowly but surely don't be too pushy because it will be very risky. because investing in bitcoin is a long-term investment,
You are not pressured to invest in Bitcoin you can start smoothly. You must acquire proper knowledge about the Bitcoin market in order to invest in different ways. After making a bitcoin investment, when you see that the bitcoin is going down, you must boldly hold your bitcoin investment. The right time to invest in Bitcoin will be when you master the investment methods like you said DCA method, then you don't need to be told to invest in Bitcoin now, you can decide for yourself when to do it. One thing to keep in mind at all times is to hold onto your bitcoins until you reach the target.