Será que foi o suficiente?

I played a total of 300 hours for the 6 chapters without counting the epilogue, I just finished chapter 6 and I'm devastated, it feels like I lost a friend, at the same time it feels like I didn't do everything I should have done with Arthur, with him alone I got around 70% of the game, I did all the missable missions, both in story mode and secondary ones, the only ones I left were the collecting ones like the fossils and the mysterious drawings (which I didn't start) and the unique horse mission (I don't know the name) which they say is the best, a friend told me not to do it with Arthur. But I did all the others that I know of. I hunted some of the legendary animals and treasures (I wanted to leave it so I can enjoy it with John too. Anyway, it seems like something is missing, maybe it's because of the attachment I got to the character of Arthur, maybe that's the normal reaction. Anyway, it's the first time I played and I fell in love and it's finally the best game of my life. But I would like to know that 300 hours is too little for Arthur?