Hi @lulitd
Here's a [https://www.youtube.com/watch?v=JwcJA-61Ijo|video] that shows how to replace the power button that may help.
Depending on the colour of the phone, search online for [https://www.google.com/search?client=firefox-b-d&q=GH98-43730|GH98-43730(insert appropriate letter]) to find suppliers of the button, e.g.GH98-43730B = White, GH98-43730E = Green, GH98-43730H = Red etc.