Make a iphone which is Easier to Hold

You're not addressing Apple here and we, just users like you, are not aware of Apple future decisions/plans.

If you'd like, you can submit your request/comment to Apple directly, using this link:--> Apple – Product Feedback - iPhone

Thanks and regards

Giulio

How about an iPhone 13 mini: https://www.apple.com/iphone-13/specs/

Or an iPhone SE: https://www.apple.com/iphone-se/specs/

Iphone 12 mini or iPhone 13 mini display size is 5.4".

Regards

Giulio

You are welcome