It's becoming impossible to book Thalasso/Conrad long term in general. I was able to secure 8 nights for this October - 4 in Thalasso and 4 at Conrad just last week. That's really the only way to go there, you need to jump between Thalasso/Le Moanna and Conrad to get a decent week there. Flights lined up too.

Whoever can swing these last minute will be able to go - but planning out for next year is becoming impossible especially after the Chase certificates are used up (those are the only ones that can be used in 2019 as of now).