Imgur now blocks several VPNs and have issues loading embedded previews in several fediverse platforms. So instead of using imgur, you could use one of the following alternatives for uploading your images.
https://postimages.org/
https://imgbox.com/
https://imgbb.com/
https://www.imagebam.com/
One downside is that images uploaded to lemmy.world are hosted on lemmy.world. If the instance ever goes down those images are gone since federation does not propagate the files. This is less of an issue for that specific instance, but I could see smaller instances disappearing and causing issues with broken image links.