Exported video file size way too big

I am using Premiere Rush to process and export 30 hour long Zoom recordings to upload to our Youtube channel. I am trimming down the file and then adding an image at the start and a branded outro at the end. When I export the file I am using the recommended YouTube settings but my file size is much bigger after exporting than it was when I imported the video to Premiere Rush for editing. 333,711KB to start with becomes 6,140,604KB after exporting. I am running out of disk space so have started storing in the Adobe cloud, but this seems to make the upload process to Youtube even slower. What am I doing wrong? How can I compress the file size to at least no bigger than what I started out with, which was totally fine quality wise.