Foreign Policy: Between now and the end of 2019, Trump will be desperately seeking a big win. His best bet is to do something dramatic in the arena of foreign policy.
As this was being written, Trump fired John Bolton, his National Security Adviser, because Bolton didn't approve of Trump's desire to make a big foreign policy "splash" but cutting some sort of deal with Afghanistan, Iran, or North Korea. Now that Bolton is gone, it's more likely that Trump will push for some sort of deal with Iran -- possibly during Trump's visit to the United Nations' General Assembly at the end of the month.
National Security: The 18th anniversary of 9/11 reminds us that one of the reasons the United States was surprised by the terrorist attacks was that then President George W. Bush didn't pay attention to critical briefings (https://www.nytimes.com/2012/09/11/opinion/the-bush-white-house-was-deaf-to-9-11-warnings.html). Now we have another President that doesn't pay attention to critical intelligence briefings. Worse yet, Trump has systematically fired all the experienced White House intelligence experts and replaced them with sycophants.
The current national-security situation suggests that, between now and year end, while Trump will not get the big win he so desperately seeks, he is increasing the odds of a big loss for the country.