IPhone home button won't work?

I have an Iphone 3gs that I've had for quite a while but it has recently had a little water damage. It kept switching off and the screen kept going black but after turning it on and off a few times it seemed to be okay, apart from the camera doesn't come on and my home button broke. I've been using notifications when I pull the screen down to get on different apps and I've also been switching the phone off and on to return to the home screen. I've been looking online for different quick fixes because I don't really want to have to replace the phone. Is there anything else I could do?

Time for a new one I guess.
It happened to my s2

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