GitHub lets you see which discussions you're subscribed to: https://github.com/notifications/subscriptions
It also lets you filter them by repo: https://github.com/notifications/subscriptions?repository=MDEwOlJlcG9zaXRvcnk1MTc2OTY4OQ%3D%3D
Perhaps we can find a place for a link to that view from the repo itself, in the discussion list: https://github.com/sindresorhus/refined-github/issues
I'm guessing we can add a link in this dropdown, even though it would link to a completely different view:

Initially suggested by @aspiers in https://github.com/sindresorhus/refined-github/issues/1604#issuecomment-472001432
Useful?
You might have seen that the link is obfuscated and it doesn't say it's for sindresorhus/refined-github:
https://github.com/notifications/subscriptions?repository=MDEwOlJlcG9zaXRvcnk1MTc2OTY4OQ%3D%3D
Thankfully this is just a base64 of the repo ID:
searchParams.set('repository', btoa(`010:Repository${select('[name="repository_id"]').value}`))
That would be great! And well done on figuring out the base64-ness. I can't quite believe that GitHub didn't implement this properly per repo, as it's such an obvious flaw in the design. It's pretty frustrating that they went to all the effort of interviewing people about the UX design prior to releasing the feature, and yet ignored or disagreed with my feedback that this would be needed.
Most helpful comment
You might have seen that the link is obfuscated and it doesn't say it's for
sindresorhus/refined-github:Thankfully this is just a base64 of the repo ID: