Add at least 2 more arenas. Seriously. The crunch at the top is just shoving more and more powerful creatures lower and lower. I have no idea how long it will take, but before you know it there will be apexes as early as the ruins - and NOT because of droppers.
All people need for ceramagnus or hadros lux raid is a level 15 irritator and high level players to help. Luckly though ludia did put a level requirement on raids but I see your point.
Bearing in mind that Jurassic World Dominion is going to come out, we will surely have a new arena, hopefully so, because in the 3 main arenas they have practically the same creatures and levels too, we must add one or two arenas between the 3 main ones sands.
they don’t even need the new movie to add arena tho, there are still a lot of cool places like visitor center, electric fence from jp1, indom paddock, raptor paddock, tall grass, jp3 aviary, etc