To get your offline printer back online, start by checking the printer's connection to the computer or network. Ensure all cables are securely connected and there are no issues with the network connection. Next, restart both the printer and the computer to refresh their connections. If using a wireless printer, try restarting your router as well. Access the printer settings on your computer and set the printer status to online. Additionally, check for any pending print jobs in the print queue and clear them if necessary. If the issue persists, consult the printer manual or manufacturer's support for further assistance.