"lost his touch","lost his bite"
hi. I'd been searching for meanings of the following phrases : "lost his touch","lost his bite" for such a long time and didn't finally understand any difference between them. hope to get any help, although I instinctively understand what they mean, according to the context.
He began to drink. He lost his touch, and editors soon discovered he could no longer be relied on. After a while, the assignments didn't come to him and the articles he wrote lost their bite and didn't sell.

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Thanks 😊. It was pretty clearly explained to me:)

Answer

In this piece, ". He lost his touch" means that he lost his ability to produce interesting, compelling text to a brief and  a timetable. He was no longer a reliable writer.

The articles "lost their bite"; this is a little different. "Their bite", in this use, means their ability to attract and stimulate readers, the particular properties that his writing used to have which made it attractive to readers.

Obviously both of these are figurative uses (of touch and bite).

I hope this helps.

https://dictionary.cambridge.org/dictionary/english/lose-your-touch

bite: 
3A sharp or pungent flavour.
‘a fresh, lemony bite’
from 
https://www.lexico.com/definition/bite