My sound button doesn't work

@shaimunzej86417 since you are not telling us what you hve already checked and already tired we assume that you a least made sure that all of your settings etc. are properly adjusted. The most common issue with that is a failed flex cable.

Since iFixit does not yet have a guide for this, use something like this video to at least get to it. Replacement flex cables are readily available at many online stores.

while you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!