Well; now; then — a discourse marker used to change topic, introduce the next action, or create a transition.
さて、次は何をしますか？
Well then, what shall we do next?
さて、問題です。日本で一番高い山は？
Now, here's a question. What is the tallest mountain in Japan?
さて、そろそろ行かないと間に合わないよ。
Well, we should get going soon or we won't make it in time.
さてと、今日はここまでにしよう。
Well then, let's stop here for today.