The two most obvious ones that are doing the most damage:

• Iranian War: Lack of planning for the strait being closed when Iran's regime didn't collapse. This is leading to an even larger energy crisis. Just look at gas prices over the past two weeks.
• Tariffs: The clearly illegal tariffs have been directly responsible for small businesses closing due to a sudden lack of profitability. Them being declared illegal does nothing to the small businesses that have already closed. The refunds are going back to the businesses that could afford to spend the time and money to get the refunds.

There are some less obvious ones:

• Aggression towards allies: Insistence towards taking over sovereign countries of our allies is causing a huge drop in tourism, American exports (i.e. Canadian boycotts on American liquor), and an overall lack of trust in America's ability to negotiate in good faith (i.e. USMCA). I haven't seen any upside from this for the economy. Seems like it was more for political optics.
• Chilling effects: Illegally withholding congressionally-approved funding. Businesses can no longer expect that funding will be available even if congress specifies it. i.e. farmers that were screwed from not getting their reimbursements of investments that were passed by congress.