それなら
それなら · sorenara · JLPT N2 · conjunction
If that's the case...
それ (that) + なら (if) = "if that's so"; say it when you're building on what was just said
Breaks into それ, meaning "that," plus なら, the conditional "if." Put together: "if that's the case, then..." It links your next point to what the other person just said.