How do you deal with fragrances evaporating from the bottle?

I bought CdG Odeur 53 4 years ago. Used it a couple of times a year at most. I notice today that of the 200ml, 100ml is gone. So it’s losing juice out of the bottle.

Not the first time this happens to me. Had it happen with Atelier Cologne Orang Sanguine as well.

How do you deal with this phenomenon?