He strikes it rich overnight with winning lottery ticket.

strike it rich: attain sudden financial success 经济上或者收入上突然获得很大的成功或者改善

以后都衣食无忧了

He will sit pretty in future.

He is well-off.

但是以前他很潦倒，在贫困线上挣扎

Paul didn't have a full-time job and earned little,he was really living from hand to mouth.

live from hand to mouth: barely have enough money to survive.没有钱养活自己

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