Is this how most people type on mobile these days, drawing lines all over a keyboard instead of tapping the individual keys? I’ve never had an iPhone so I don’t even know if they can do this natively, but I know you can switch keyboards at least, so it should still be an option if not.
I started out using the Swype app back before it was a common feature. It works well for me and I’ve been using it ever since. The learning curve is not steep and it speeds up my typing back at least a factor of two.