Depending on what you've found and tried from official Epson web site, drivers appear (to be) for Mojave 10.14.
• Epson WorkForce Pro W-4020 | WorkForce Series | Support | Epson US: Downloads & Drivers...
https://epson.com/Support/Printers/Single-Function-Inkjet-Printers/WorkForce-Ser ies/Epson-WorkForce-Pro-WP-4020/s/SPT_C11CB30201?review-filter=macOS+10.14.x…
And depending on location, certain regional sites from manufacturers may offer different driver software.
IF that isn't satisfactory, you may need to see about later model Epson (EcoTank) or another brand.
{..I've two older Epson (WF + Photo) and have 'spotty support' across several versions macOS + OS X..}
