If it was solely a Donald Trump problem, then that damage can be easily recovered with new leadership. However, that is not where the problem is.
The problem is with the entire American political system and the deep state that has allowed him to do all this without any democratic guardrails and without any checks or balances. That is where the trust is gone, it is gone from the American state and political system itself for being so dysfunctional, and that is the part that is pulling countries away from the USA.
No one can believe that the American "state" and institutions is allowing him to do all that his is, it is "unchecked" chaos that "allowed" that is the issue.
( hope i am making my point, etc).