However, I fully understand that the personality of the president matters very little compared to the policies they are enacting and support.
That is simply not true. The office of president plays the primary role in conducting foreign policy for the nation. His history of insulting allies with personal attacks, name calling, trying to overpower other world leaders with firm handshakes or creeping behind them, nationalist & racist attacks by calling other places shitholes, and repeated submissive behavior to anything Russia does, are all driven first and foremost by his personality.
Meanwhile his ambassadors, who work to repair this damage to foreign policy, mostly come from the ranks of unqualified campaign donors, rather than career diplomats. Both parties abuse this system, but prior presidents would give away donor rewards to places like a tiny tropical island, while the current administrations donor reward system surpasses all previous presidents. Half of the countries in the world have an American ambassador who bought the position. Never before has effectively half of America's foreign policy been for sale to the highest bidder. I think it's fair to ask what these various people are hoping to achieve with the ambassadorship that in some cases, they specifically requested and paid for? Does their personal agenda differ from what a career diplomat would do in advancing Americas agenda?
I think "America First", is a poor foreign policy message to other countries, that makes them far less likely to enter into partnerships and cooperation with us, and far more likely to raise overall costs and ultimately make the deals worse, because of human nature. I also think that NATO has been a useful organization, and believe our foreign policy plays an important role in our wealth, and safety.
Sadly many don't see they are being manipulated, and most of those don't react well to being shown this truth.
On this point, we agree. Tribalism makes it far to easy for people to dismiss valid criticisms.