where I can buy Home button for my iphone 7 plus

Jaie ~ Is the battery the original one? ...Because an aged battery can cause weird problems that only appear to be due to hardware buttons. What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

iPhone Battery & Power Repair

Apple Repair

Apple - Find Locations - Location Selector

(Articles found by searching Apple's Knowledge Base.)

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Jaie0812 wrote: "yeah its 73%"

That's not good – anything around 80% can be expected to cause problems. ...Have the battery replaced and don't be tempted to "go cheap":

About genuine iPhone batteries

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Jaie0812 wrote: "do u have any idea where i can have the orig and the home button too"

It's not clear – the orig what?

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Jaie0812 wrote: "original i mean hehe"

It's still not clear – the original what in this sentence?...

"...where i can have the original and the home button too"

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The ONLY place to get it fixed is at Apple or an authorized Apple service provider.