@stux Hi,
It might help you to look into moving towards object storage. Most blobs are saved in the postgres database, which is quite expensive and doesn't scale well.
With object storage you don't have this issue anymore. Here are some how to's. Good luck.
https://thomas-leister.de/en/mastodon-s3-media-storage/
https://stanislas.blog/2018/05/moving-mastodon-media-files-to-wasabi-object-storage/