What the 4chan moderation team decides to do with /mlp/ is quite literally not our problem.
Yes, it's shitty what's happening over there, but no amount of obsessed schizo screeching will ever fix any problem while the current moderation team exists. If anything, all the moaning and bitching has ever served to do is make the problem worse by showing a dedicated group exists that can be effortlessly trolled, who will readily bite the weakest baits without fail with Lee-like dedication.
As for making the site more active, that has already been extensively discussed in the thread dedicated to the topic.
In particular, I recommend reading this post >>>/fim/9215
Basically, trying to advertise that this place exists on /mlp/ is an uphill and mostly fruitless battle.
There's two factors to this. First, most of the remaining FiM posters on /mlp/ have most likely been posting on /mlp/ for many years now. They have an understandably strong emotional attachment to the board. In their minds, it's the ONLY place to ever post; they'll either post there or sink with the ship.
Second, besides simply being against the rules, acting like a shill is also horribly ineffective, because the people trolling with EqG are the same people who jump at any mention of this site with slander and misinformation. They control the narrative there.
tl;dr? I think it's best to keep a lower profile instead of trying to force anons to come here and attracting bad attention. The deeper /mlp/ sinks into the depths, the more anons are naturally going to want an alternative. Most already know this place exists, so it's only a matter of time.