You can, but whether that gets your membership back, I really don't know.

Flicker images can't just be credited to make their use okay. Their copyright licenses are stricter by default. You must have explicit permission from the image owner to use pictures from there or have purchased the rights from the image owner. Images on Flickr make things complicated and it's best to just not use ones from there.

The general rule I use is that images should have the image creator, the website where the image is originally from, and a link to the source of the image. The built-in Unsplash tool on Medium does this automatically so I've always copied that format for my own image credits.