It’s time
First of all, I’m going to address the fact that monsters that logically shouldn’t be in certain biomes are squeezed in said biomes. That in addition to general oversaturation of biomes going forward as well as new, more out there monsters that will be probably added sooner or later, creates an issue. Like, okay, I can maybe believe that Legiana rolls around a murky swamp if I squint my eyes and not think about it. But Velkhana later down the line? Ye, no dice.
Therefore I think it’s time to introduce more biomes - and redistribute current roster accordingly. I know this can and probably will irk some people in the wrong way, but please understand, if this game gets to be updated regularly, we are looking at hundreds of monsters, and simply need more room, unless you want to hunt for specific beast for weeks on end due to high saturation