My hearing deteriorated due to loud music. Can the deterioration be stopped by avoiding loud music and noises?

You can. This is most often the case. You can not only stop the deterioration, but also restore hearing. As soon as you stop listening to music at high volume, your hearing begins to return. You can motivate yourself by the fact that at an average volume, the human ear hears more detailed sound. The scene of the sound event becomes wider and more interesting.

It's a pity that this happened. Refusal to listen to loud music and harmful profession in such cases, of course, is necessary. This will stop further hearing impairment due to increased sound load.

But, perhaps, in fact, hearing loss is not a consequence of listening to loud music, but the cause is the disease. Therefore, it is worth contacting an audiologist (a doctor who deals with hearing) and try to find out or confirm the reason, get recommendations.