Arrakis, what did you expect, a massive increase in the amount of players? The only way to achieve that is through other forums, otherwise it will always remain the randomn one or two nobles that join the realm in the normal fashion, having a war will increase the odds for this to happen, but Niselur has only been at war for a couple of weeks, whereas other realms have been in several wars constantly and have thus managed to attract the players looking for a realm, in the past.
If you had been the only realm fighting against Astrum, I'm sure nobody would have bothered joining Astrum and several people might've joined Niselur, but now Astrum is the underdog realm (damn it looks so much smaller already), and people like joining underdog realms.
It's the Great Dwilight War, pretty much every realm is at war and is campaigning, and even as a knight, I think it's pretty fun, with the Saffalorians joining Barca, we now have more than 3 nobles per region which is pretty insane for a realm with dirt-poor regions. But hey, we'll be getting quite a few new ones now at least from Aurvandil.
It's clear the war has at least one positive effect, as it has revived Astrum. Hopefully they keep it fun this time and don't make everyone pause their characters to boredom again.
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ninja'd by glaumring, my post is in the same line as his in some ways
edit:
Looking at realm statistics, it looks like niselur is doing fine, your noble count has gone up. Maybe you should consider not-expanding. It doesn't really seem necessary to take over all those regions when you're already with a surplus of regions without lords. Just pillage and kill, or consider losing some regions, or split your realm because, damn it's quite large.