Although bitcoin is very good and promising but i suggest not to put all the money in bitcoin, this is very risky, many people are crazy and stressed because of losses, of course only investing in values that have no effect is a better thing, i suggest if you already profit then immediately sell and leave some is better.
Putting money in bitcoin is more guaranteed for recovery than altcoins, so why do you say investing all money in bitcoin is risky?
if you are in doubt then make sure you buy bitcoin at the lowest price so as to avoid big losses, actually there is no loss if you still hold Bitcoin until the next ATH.