Time is the best way.
I am fortunate enough to have a fairly large collection of E-Liquids so when I get more, it is usually a couple of weeks before I touch them.
You can also try putting them in ZipLoc bags and immersing them into very, very warm water in a pot and then letting it cool down to room temp.
You can also try removing the caps and drip tips and setting them in a cool dark place away from kids and pets and anything that could knock them over for 8 hours.
But time is best.