What to do if my home button doesn’t work on my iPhone 8 Plus
My home button on my iPhone 8 Plus isn’t working, what do I do?
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If a button or switch isn't working on your iPhone or iPad, click here -> If a button or switch isn't working on your iPhone or iPad - Apple Support
Use AssistiveTouch on your iPhone, iPad, or iPod touch - Apple Support - Some people activate Assistive Touch as a temporary work-around to a problematic Home Button. Realize that some basic functions such as those activated when starting a phone may require a Home Button and repairs will be necessary.
For the 'iPhone Service Answer Center' click here --> https://support.apple.com/iPhone/repair/service