I was confounded at the huge numbers of unsullied and dothraki at the end of the king's landing battle. With a force so sizeable, it is no wonder Dany felt emboldened to take on the world.
However, I find the size of her forces to be rather a mystery. I was under the impression that virtually 100% of the dothraki died fighting at winterfell and that maybe 80-90% of unsullied died too. Imo, Danys remaining forces should have been a fraction of what was displayed and therefore would have required her to maintain a degree of humility if she had further aspirations.
All in all, I did not like the shows finale. Jon deserved better. Even a fantastic death would have been better than what he got. Arya was a wasted end of character. Ugh. Such a bad way to settle things.