Economics is complicated, with people like POTUS having influence for years after leaving office due to their policies. As such, it's usually disingenuous to place the blame (or credit) on a single person.

It's rare that you have such a clear cause and effect in place. Right now, the economy is still ok in spite of Trump, and everyone agrees on that. His actions, by all rights, should've already cratered the US economy for at least a generation.