The ink cartridges may be old or low on ink, and you may need to replace them.
Your printed colors can never exactly match your on-screen colors. However, you can use a color management system to get as close as possible. Try using the ICM (Windows) or ColorSync (Macintosh) setting.
If you’re using color management in your application, select Off (No Color Adjustment) to disable color management in the printer software.
For best results, use genuine Epson ink and paper.