Should we purchase additional units when the market is down in mutual funds?

If a sale is going in a supermarket, would you go and buy more of the groceries that you normally buy?

Same goes with investments. But most people run in the opposite direction when a sale happens in the mutual fund markets.

Based on your current cash situation and other family needs, you must top up any investments if you have cash available. This depends on your personal risk profile and current goals.