I'm very happy about my first prize in the English competition, but I also know that I must keep both feet on the ground and learn more.

我很高兴我在英语竞赛中获得一等奖，但我也明白我必须脚踏实地继续学习。

youdao

In that respect he needs to keep his feet on the ground and not get carried away.

就那方面看来，他需要脚踏实地而不能飘飘然。

《柯林斯英汉双解大词典》

Keep your feet on the floor.

把脚放在地板上。

youdao

And Mr Shepherd said the company would keep its feet on the ground, despite its record performance.

BBC: Newcastle net record profit

Thomas is also trying to keep his feet on the ground, despite the growing excitement around the County Ground.

BBC: Somerset's Alfonso Thomas reveals deal with Trescothick

Because I wanted to keep my feet on English soil, I had decided to use no buses or underground transportation during my visit.

WSJ: Alan Bradley on Writing About an England He'd Never Seen | Traveler's Tale