Nobody can tell you exactly when to buy. In comparison to the last few months the price is relatively low , you can buy some now and just keep adding to that stack every month. This way you can average the price you bought for.
if you intend to invest long-term, it is very appropriate to include your funds now and always increase the investment when prices fall and sell later in the day when the price doubled ,, and for that ,, I suggest you go in bitcoin da ETH to have it