This comes up a lot, and it usually amounts to the same thing each time: not much. I'm not trying to dishearten anyone, or say your efforts are going to be wasted because that just isn't true. But I think forums like this are just not going to be able to have the same presence they used to.
Now on to contributing. I don't think we should rebrand ourselves. Every person who joined this forum has at least one thing in common. We loved fire emblem enough to seek out a community that shares the same love for the series. It may not be super prevalent in our recent threads, but for the most part I think everyone here has fond memories of struggling against their first game only to come out on top(and then feel awful when the character info starts to roll and you realize how many people you let die). I guess what I'm saying is that regardless of what we talk about the thing that brought us here is FE, so it should stay as an FE forum.
As for how we go about moving forward...well that's more difficult really. Updating the home page is a good start of course, but where do you go from there? There's no point in forcing yourself to come up with fire emblem based content just because that's the theme of the forum. It'll only hurt your motivation for posting in general. What we could do is drum up interest in little events built around the games that everyone can enjoy. I'm not sure where I'm going with this really, but I hope someone else reads it and comes up with something good =P
Edit: now that i've got myself thoroughly awake way too early(lucky i don't have to work today) i'm now thinking about how to get some FE hype flowing. i've come up with a few things, none of them original in any way of course. first thought that came to mind was writing an FE fanfic. i haven't done any serious writing in a long time now, and it's about time to fire up the thinkmelon anyway to get ready for college english courses. the second one was we could organize some community streaming/recording of games where 2-3 members are doing an LP/guide/just talking/whatever they want basically while one of them plays. spriting contests are also a fun way to get people involved, but i'm not sure how much interest people here have in that. last idea i had was to do a community theorycraft of the "perfect" Fire Emblem. like we would decide what mechanics it would use, how balanced it is, the difficulty, extra features like dlc addons, everything else that i can't think of because it's nearly 2am. idk about you guys, but i'd have a lot of fun talking about that kind of thing with everyone.