Best way to optimize large CorelDRAW files for sharing?

Hi everyone,
I’m working on a few fairly complex CorelDRAW (CDR) files — lots of vector elements, some high-res images, and effects like transparencies. It's actually a collage picturing several bouquets that I created for a Swiss flower company. But the file sizes are getting pretty heavy, and it’s becoming difficult to share or archive them efficiently.

Does anyone have tips or best practices for optimizing or reducing CDR file size without compromising too much on quality?
Also curious if anyone uses a particular export or packaging method when sending files to clients or print shops.

Thanks in advance!

Martin
Geneva-Switzerland