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/
Same here in Australia. Might only be a select few smaller ISPs that have blocked it, ie the ones the government can bully easily.
It’s seems like it’s only a dns level block, so changing to non-isp dns might help you bypass that restriction.