Buying 14d or 30d boosters is not that impossible, but it is very tedious. I leveled up to 40 by buying things and it's still too boring, not even events make things better.
It would be interesting to have different ways to get XP, I'm talking a significant amount, not 50 or 100 by killing mobs.
There is a lack of challenge or something that motivates the players. For example, linking the story to the game, bringing NPC characters to life, fighting against them to prove our strength when the NPC is 99% complete and it's the last mission, something like that.
make quest dinosaurs monstrous in a different way, not just big. Make a scary appearance, a different map that has relief for a possible challenge cave, etc.