Just off the top of my head - and granted not everything was official "policy".
Environmental Policy.
Running his administration with a dozens and dozens of "acting" leadership because he couldn't nominate quality people.
Putting families in cages.
Kowtowing to Putin like a sycophant.
Being played and being owned by China in a "Trade War"
Paying the farmers $28 Billion during the trade war -- and the Trumpians say they don't like to hand out money for nothing LMAO.
Pissing off and alienating every world "Partner" we could previously rely on.
Being played by Rocket Man ... like a fiddle.
His response to Covid that cost Americans 10,000's of lives.
His response to Khashoggi and pandering to the Saudi's.
Putting unqualified next of kin and in-laws in charge of things they had zero ability to be involved with.
Giving away a $1.9 million in tax cuts - in an economy that was red hot and not getting ANY return (unless you were a 1 percenter).
Ending press briefing and running his administration thru social media.
Using the DOJ as his private henchman service.
Generally spitting in the face of any process, accountability and norms of our Government.
Oh - and trying to prevent the peaceful transition of power through lies. That ones pretty big too.
The list is very long. And Biden's list of issues and mistakes and incompetence might end up being long too. But he'd need 4 terms to achieve the list and level of ineptitude Trump managed.
EDIT -
Not listening to the military and pulling out of Syria allowing the genocide of Kurds who had been partners.
Telling the world that he would rather take the word of Putin than all his intelligence agencies (and those of partners around the globe).
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