There are numerous possible reasons why your printer is not working the way it is expected and shows Epson printer offline. Experts always suggest that you find the cause of the problem first to find the solution to fix it. But, because this is a very common issue and nothing to be concerned about you can move to fix it directly. There are 4 safe and possible ways to fix it if you are doing it on your own-
• Check the power connection and physical connection between the devices is properly made.
• Check the printer settings. Your printer might be set to use in offline mode.
• Check whether your printer driver is outdated. Update it if a new version is available
• Lastly, Reinstall the printer. It is advised to choose this option under the observation of experts.
Hope this helps you in fixing your issue.