Hello,
I’ve tried adding every single repo and I thought I might as well give you an idea of what repos should be checked whether they are still functioning or not. As of 11.8.2022 the following were not working for me:
Alefvanoon’s Repo: https://repo.alefvanoon.xyz/fdroid/repo/
Anonymous Messenger: Anonymous Messenger Official Repo
app.usb0.net: https://app.usb0.net/repo
Cisti.org: https://fdroid.cisti.org/repo/
gsantner (public): https://gsantner.gitlab.io/fdroid/repo
pilight: https://android.pilight.org
RWTH Aachen University: https://app.rwth-aachen.de/fdroid
StoryMaker: https://s3.amazonaws.com/storymaker/fdroid/repo
Also I’ve found the last one (StoryMaker) in the list of abandoned repositories, so I assume it should have been removed from this list. Hope the others will be working again soon. 