From my own perspective I think everyone has to be prepared to invest,even in the therms of down fall you shouldn't be discouraged in whatever you invested in, because the end points is the main reason you always invest your money.
Getting prepared as an investors is under statement because you as good investor should be ever ready at all times to invest, with DCA strategy i don't think an investors be discouraged or can ever fall at the lowest of his total money he used to an investment, so i will advice that an investors should have it in the back of his mind that investing in Bitcoin is what you should be ever ready to buy Bitcoin at any given period and no time that is too late to invest in.