Until 2 months ago, it was a green and shiny leaves bonsai. Suddenly, the leaves started getting yellow, afterwards falling down one by one...now it looks like this.
I gave him nutrients but in vain.
The picture with a few leaves is from 17 Sept.
Can someone tell me if there is any chance to revive him?
Many thanks in advance!

could you please post a picture?

In general, fertilizing a tree that is doing poorly is a bad idea..

Thank you for feedback!
However, the brownish things at the extremities of the brunches look like a disease?
Any suggestion?

It looks beyond rescue to me.

Sad to hear this but thanks for your feedback!