Normally I would suggest doing a software update on your phone to ensure that it isn't a software issue, but without the touch screen there's no way to accomplish that. Even hooking it up to a computer won't work since you still have to enable the data transfer mode on the phone.
You could open up the phone and try to reseat the LCD connector, as it's possible it's come loose, but on your phone there's only one connector so if it was loose I would expect to see problems with the LCD as well as the touch screen.
At this point the only suggestion I have is to go ahead and replace the screen. They seem to be readily available on places like Amazon, eBay, AliExpress and several other sites; some of the prices I saw were as low as $10 USD. Google is your friend here in locating a suitable replacement. The replacement procedure appears to be fairly straight-forward as far as cell phones go; again you can use Google to find tutorials, but I looked through this one and it seems to be usable.
How To OPPO A7 Screen Repair & Replacement - YouTube
Good luck; let us know how it goes!
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