LG G3 - Screen is busted

Hey folks. Thanx for reading this. I have a LG G3; I use a PODFOB CASE with it;

When few days ago I came to my gym, and was ready to get out of my car. the phone was already hanging around my neck; I lost my footing and busted my ass face first. The phone was around my neck at the time. Obviously the phone smacked the ground also. So did my chin :)

But now the screen is busted and I want to make a copy of my old phone and place this backup on to my new LG G3 (I already got a new one)

But how?? The only remedy I found, to get anything of the phone is by connecting an OTG cable to the phone and any USB mouse to the other end. The broken screen has a cursor light up; you can do anything now...

But, my issue is: since I never rooted the phone I don't know what app to install to take a "snapshot" of my OLD LG. I want to copy customizations I have on here over to my new phone. Not the settings, but anything that is possible to transfer...

So my question is: is there anyways I can get root without of plugging the phone anywhere??

Why I need root, because I believe there are programs out there that can MIRROR my old phone to this new one; but I need to have this ROOT...

Are there any ways to get root by NOT plugging your phone up with your computer??

Or, if there is none, is there another adapter I can buy that will split this USB plug on the phone??

I can't be the first person to bust my screen...What do people do in this situation?? Thank You folks