Can I keep the couplets until next year?

Couplets that have not been posted in previous years can continue to be used, because posting couplets is symbolic and I hope to make a fortune. There is no clear custom that the rest cannot be used.

Spring Festival couplets, also known as "spring stickers", "door pairs" and "couplets", are one of the red festive elements "Year Red" posted during the New Year.