Like it or not; long-term investing is still a Game Of Strategies.
You will need to find your own investing strategies to match your investing goals to build wealth during accumulation phase or build sustainable retirement income for life during distribution phase.
Both DCA and Lump Sum investing can be considered as save and invest strategy. For DCA you save and invest regularly. For Lump sum you invest when you have enough money.
For War Chest, you already have the money to invest but time the market…