Nothing like that is taboo. That your subscription was cancelled, if paid up, seems to have been a mistake that needs to be addressed by the company.
It's good practice to Clear Unused Cache files prior to beginning a new project. If the O/S drive free space is limited, point the cache to another drive with ample capacity via OPTIONS | DISK tab. There's no 'optimization' setting.
Starting with a clean cache here, a 2.06GB HEVC 5312x2988 file used 548Mb of cache space. Share a 1Gb file that consumes 15-20 gigs...
Upload the file/s to a free server, such as Google Drive or MS OneDrive, right-click the link and Share or Copy. Copy the result and paste it here or to me in a Private Message via the mail envelope in the top-right corner of this forum. When using Google Drive, click SHARE | SHARE and change "restricted" to "anyone with link can view.**