Downloading remote images disabled due to disk space

I just got the disk space limit message. I’ve been periodically cleaning up old Docker containers but my available disk space has simply depleted over time.

Is the only solution to upgrade my droplet (on Digital Ocean)? My memory usage seems fine; it’s just a disk space issue. Seems overkill to move up to their next plan. Would enabling a CND or configuring uploads to S3 help?