Your friend has achieved results, and you encourage him to work hard. If you use a four-character idiom, it is (), if you use an eight-character idiom, it is (), if you use an ancient poem, it can be

Keep up the good work and make further progress

When I met Wang Jian, I gave him a gift (Zhang Ji)

The new poems are perfect, and I will discuss them in my spare time*** Thinking.

I am now more than thirty years old, but I still say that I am still the same as yesterday.

Inscription on Bamboo (Dai Xi)

After the rain, the dragon grows tall, and the phoenix tail shakes before the wind.

A weak heart is firmly rooted, and the sky will be fixed by the day.