You might ask, why even bother? The man is a walking, talking negative ad every day he remains in office, and it’s all free! What’s more, he’s likely to become even more unhinged as his desperation increases. Just put out positive, reassuring ads and let events take their course.
For the most part, that will work, but there are certain parts of Trump’s record that require some emphasis. Make sure the public doesn’t fall for his efforts to rewrite history on the virus. Show him as being weak and inept on China. Run footage of him as an ignorant, capricious leader who is laughed at by the rest of the world. Correct the public misconception that he is a self-made man. Portray him as a friend of plutocrats who consistently opposes regulations and legislation that would help average workers.
But don’t spend much money on the corruption and authoritarian angles, because everyone already knows about them. It’s a waste of resources.