Both works.
DCA is a disciplined way to accumulated investment and not to time the market. It is intended to ride you through the ups and downs of market volatility. Lump sum investment has the benefit of taking advantage when opportunity calls.
In a shorter time frame, Lumpsum investor expects higher risks or rewards than the DCA investor.  But in the longer time frame, both positions should work out to be rather similar.
So invest the way you are comfortable with, as long as you have done yo...