Hi,
Since the Epson ET-4750 is an AirPrint model, I assume that it is connected (wirelessly or by Ethernet) to the same network (Wi-Fi router) as the computer. In this case, additional drivers are not required.
About AirPrint - Apple Support
Any change if you try the following power-cycle sequence?
Power off the router, the printer, the Mac, and all other devices/computers. Wait two to three minutes. Power on the router. Wait two to three minutes. Power on the printer. Wait a minute or two. Power on the Mac. Finally, power on all other devices/computers.
If AirPrint is not used (for example, for a USB connection), drivers from the printer manufacturer would be needed.
https://epson.com/Support/Printers/All-In-Ones/ET-Series/Epson-ET-4750/s/SPT_C11CG19201?review-filter=macOS+10.15.x
Add a printer on Mac – Apple Support (UK)
Reset the Mac printing system to solve a problem – Apple Support (UK)