First I want to say that Ikigai is my favorite book all categories. I love your ambition.
In the book you´re talkning about how happiness not is your goal, how you´re trying to act as if you emotions didn´t matter and come up with your meaning in your life in a rational way. "Im on Team Human. I want to see our species thrive and grow".
If emotions didn´t exist, why does it matter for human species to survive and expand? What makes growth of humanity more important than other species? What makes something positive or negative without emotions?
You think that happiness is a bad goal because it´s only serotonine and dopamine in the brain. What makes living beings with the name "human" on different objects called "planets" flying around in space a good goal?
Not saying you´re right or wrong, just want to hear your thoughts. Some people say that soccer only is a bunch of people running around and kicking on a ball. Any activity can be intresting or nonsense depending on how it´s looked upon. Maybe it´s the same with goals.