According to Microsoft, " If you continue to use Windows XP after support ends on Tuesday April 8, 2014 , your computer will still work but it might become more vulnerable to security risks and viruses. "
There are only 2 options and the first one really doesn't apply to most XP computers because they probably can't handle the upgrade.
1. Upgrade to Windows 8.1
2. Get a new computer.
I would make sure everything important to me is saved on a flash drive and begin planning for a new computer. Then I would run my XP machine until it crashes or becomes too problematic to be worth keeping. It may run just fine several more years as Microsoft is often a little more histrionic than truthful. They claimed that Microsoft Office XP would not work on Windows Vista or 7 or 8 and it still does.
Remember, Vista, 7 used machines are still an option and are still supported for a few more years so a used computer can stay protected unlike your XP machine.