I found how to turn the Health app back on after I accidentally deleted it.
How to find the Health app and turn it back on?
iPhone 7 Plus, 12
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Let’s go into settings>Siri&Search,
scroll down until you find “Health” ,
turn “Siri&Suggestions” on,
turn “Show App” on,
it allows “Health” to appear again,
and you will see “Health” app come back on your home screen.