iPhone 6+'s mute button doesn't unmute (stuck in silent mode).

Hello.

My old, used iPhone 6+ (iOS v12.4.8)'s left physical mute button doesn't

unmute when set to unmute anymore (stuck in silent mode). I assume it is

worned out from its age from early 2015.

Is there a way to unmute via iOS? Even when muted, I still get some

audios like from Music app, but not from games. I read physical mute

toggle will not play audio from them. I wonder if it is possible to

override this via iOS without having to physically open the iPhone and

possiblly break it more.

Thank you for reading and hopefully answering. :)