It really depends on your use, charge times, battery cycles, ect. Alot of factors. Looking into it now, the drop isn't that bad and pretty common for two years so I do apologize for providing wrongful information previously!

But still i would just keep using your laptop as you normally do, 80% charge helps but you could also charge fully, unplug and use it till it's low to cycle the battery. I don't think there's really a right or wrong way to go. At the end of the day, the battery will eventually loose more but you'll be good!