Always been a fan of Hacker News at Y Combinator: https://news.ycombinator.com/
And we built and maintain a Reddit / Hacker News alternative at Cyber Report focused on cybersecurity: https://cyber.report/
Edit: in my own personal interest niche category of Archery, and this is interesting: https://www.archerytalk.com/ Archery Talk was always much bigger and popular than the subreddit for archery. I wonder how many niche topics always had a non-reddit, category dominant forum. A lot probably.
Howdy penguin, thank you if can offer some help. Contacting you in Matrix now via username somewhat “cyber” styled