Launcher 3 has stopped- can't access normal phone menus??

I have a galaxy j7 prime. Unfortunately I can't even say what OS is running because I can't access any of the normal menus or the home screen. The launcher keeps failing so the only way I can access apps is from the pull-down menu when I have notifications.

Is there a way to deal with this? I haven't downloaded anything weird that I know of. Is there anything short of a factory reset that would help? Thankfully I have pretty much everything I think I'd want to save on an SD card because otherwise I wouldn't even know how to back anything up.

I've seen on other launcher questions that people say go to the system settings.. but I can't even access that! Please help!

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