Well, I'm writing on a phone so I'll be brief...
1. You probably through your absence missed the worst times of institutional paralyses due to Tay's disappearance. This was partially resolved by Emi taking charge, but generally, nothing could be done on Fuwa for literal years because Tay went AWOL. When it got (partially) fixed, there was no energy left to ressurect the site as something more than the Forums, which is also staying alive through inertia more than anything else. Because no main site content = no traffic and no new people.
2. The main roles of this site are not as important as they once were. People get news and discuss them on Reddit. Socialise on Discord. Organise fan translation... Pretty much nowhere because those are dead. I'm being hyperbolic, but only a little. Fuwa is a cool community... But is in no way essential as it once was. The "fix" I was hoping to spearhead for that issue was making it something like an editorial/review hub once more... But few people, me including, had any kind of energy for it, and none had enough for long-term commitment.
3. When it goes to the community itself and the atmosphere on the site, I think it's overwhelmingly positive. I'm not objective here of course, but I don't think it's toxic members of any kind of cultural flaw that keeps Fuwa down. Unless you count lethargy as one.
I don't want to discourage you and any initiative to energise the community is welcomed. I'm not sure there's an answer to this crisis though, different then the community being old, slightly anachronistic and really not having time or energy for all that reforming/rebuilding business. :>