WordPress lets you use sticky posts to showcase things you don’t want your visitors to miss. It is very easy to set up from the Publish box. But removing them manually can be a hassle. For starters, you need to remember when to remove them. The Scheduled Unsticky plugin can help. It lets you remove your sticky posts after a certain period of time has passed.
This plugin allows you to remove sticky flags automatically. Just go to Reading > Scheduled Unsticky Settings and change them. Simple but gets the job done.