It is ironical that we talk about usenet everywhere but on usenet. Events like the blackout on reddit and the scramble to move to alternate platforms would hardly be necessary if usenet worked clearly as a discussion platform.
While everyone blames spam for the slow death of discussions on usenet, I think there are a couple of other reasons:
access over http
searchability
These two reasons are why Google Groups continues to work while discussions on usenet barely do.
Usenet has to evolve to provide solutions to these problems:
spam: moderated groups are an insufficient solution when compared to moderation tools provided by modern discussion platforms.
usenet over http: people should be able to carry on discussions using browsers as well as apps. They should be able to share links to these discussions as well.
search: people should be able to conduct a search across all discussions by using native as well as third-party search engines (Google, Bing, Brave etc).
usenet has been rumored to be dying for years but it is still used. It has a little group of enthusiasts but it is alive. Here an interesting article on Usenet, with some thoughts https://shkspr.mobi/blog/2023/06/why-did-usenet-fail/