まだまだこれからit's not over yet, you haven't seen anything yet, it's not over until the fat lady sings, it's too soon to tell, we're not out of the woods

諦(あきら)めないぞ！まだまだこれからだ！

I won't give up! It's not over yet!

冬(ふゆ)の本番(ほんばん)はまだまだこれからだ。気(き)を緩(ゆる)めるな。

The worst of winter is still yet to come. Don't let your guard down.

師匠(ししょう)：「お前(まえ)はまだまだこれからだ。もっと修行(しゅぎょう)が必要(ひつよう)だ。」

Master: 'You still have a long way to go. You need more training.'

先生(せんせい)：「日本語(にほんご)の習得(しゅうとく)はまだまだこれからですよ。焦(あせ)るべからず。」

Teacher: 'There is still a road ahead in learning Japanese. Don't rush it.'

寒(さむ)さの本番(ほんばん)がまだまだこれからだと考(かんが)えると、なんだか不安(ふあん)に感(かん)じてきました。

When I think that the real cold is yet to come, I somehow start to feel anxious.