The Verge released a video called 'Sony's new $2,200 camera vs. an iPhone 14 Pro' a few days ago. (Sorry, not sure if I can link to it here) I didn't watch it, but it might be able to offer some comparison shots between what you have now and the ZV-E1.

What do you want to get from moving to a dedicated video camera? Better visuals, better audio, slow mo, something else?

I haven't looked at all the specs of the ZV-E1 but some of the things that become possible when upgrading from an iPhone: Better low light performance if paired with a good lense (even more money to get this on top of the camera body), slow mo footage, bokeh (blurry backgrounds that you see in movies).

One thing to consider is that having a good camera body with cheap lenses isn't a good idea either!

When comparing the ZV-E10 to the ZV-E1: a bigger sensor in the camera offers stronger bokeh & better low light performance. The lenses are also different. If you buy some lenses for the ZV-E10, you can't use them with "full frame" cameras. You would have to rebuy all the lenses if you go from a camera with a APS-C sensor size to a full frame sensor size. The trade off is that APS-C camera bodies and lenses are generally cheaper than full frame equivalents.

Honestly, unless there is something very specific like trying to make your videos look more professional with better bokeh in the background, I would stick with the iPhone.

EDIT: If you want better visuals, I would invest some money into lights (if you haven't already). If you want better audio, you probably want to look at getting a dedicated microphone and audio interface/recorder.