I keep having to ask this every thread, but you know you can double tap the home button and it will bring the screen half way down so you can reach easier.
I have no problem using my 8 one handed, and can even use it one handed while biking
I downgraded to an SE recently and the only thing I miss is the screen size; traded that for headphone jack, smaller form that fits my hand nicely, and a design I like better.
Yet here I am years later still double tapping my home button several times a day
Please don't :(