@agushardiyanto it could be the mechanical button but most likely it is a bad flex cable. The part you are looking for looks [https://www.aliexpress.us/item/3256802422231062.html?gatewayAdapt=glo2usa4itemAdapt|like this] Just an example, not en endorsement.
Since iFixit does not yet have a specific guide for that, use something like [link|https://www.youtube.com/watch?v=jTBAv6QJi-Y|this video|new_window=true] to work on it.
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. [link|https://ifixit.com/Guide/new|https://ifixit.com/Guide/new|new_window=true] The iFixit community will appreciate this.
Repair is War on Entropy!