Ah, yeah. Saidit has become very political, to the point where posting anything else seems pointless. Furthermore, it's largely inhabited by right-wingers, due to the fact that they've been banned or censored on other platforms. So the first and third would be good ideas.

If you go with the second, which is also a good idea, perhaps it could be focused around professional and well-sourced discussion/debate, as opposed to the more casual nature of Saidit. I've often found myself posting essays I write here, but it doesn't ever seem to me like this is the optimal place for that.

A non-political version of Saidit would probably see some use, but I think the best option would be to develop non-political subs and make new ones. A big problem is that people go to Saidit for politics and Reddit for hobbies — and this would still be the problem for a new website.

I'm a radical centrist, so I'd definitely use a centrist version of Saidit, but I don't think many others would. A lot of people would just stay here, so you'd have to compete with yourself. A good option, perhaps, would be to create a centrist sub.

I think the second idea is the best, because it can stay more general while having better quality posts. It would still have to compete with Saidit, though, which means it would have to be built fundamentally different. Perhaps it could be built for in-depth discussion, rather than casual conversation.

Whatever you do, it can't just be "Saidit, but x" — it has to be its own thing. You never want to compete with yourself, because you'll always lose. I don't remember where I heard that quote, but some old dude probably said it.

That's just my opinion, not sure why I wrote a mini essay on it, but whatever.