December 2023 Honeymoon; are we too late to book anything?

We are getting married in November but plan to honeymoon in December when my fiancé’s semester is over (he works at a college). We would like to go somewhere relaxing, nice weather, maybe tropical, all inclusive would be ideal. After some research, our budget is 7-10k for a one week stay. We are in the US so we prefer outside the US. Some Sandals packages i saw were sold out! Is it because we are planning over the Holiday season? Open to ideas and suggestions.