if i understand correctly what you are talking about….
this might help you navigate without a home button
(personally, i wish the world still ran on fountain pens and carbon paper, and i especially hate having to return to kindy level every time some piece of technology makes a leap-forward.)
alternatively here is a very short video clip with demonstrations…
the home screen example is near the end-
https://youtube.com/shorts/674dVZizwr4?
late edit. i have never used siri, and keep it turned off on all devices.
if i use the microphone function (usually to dictate draft of an alt text while staring at a picture) i always have to edit because the system does not understand much of what i say. if i had to rely on siri i would be up shot creek good and proper.