Donations. Volunteering for Trump-endorsed candidates in the midterms. Calling your representatives to urge them to support Trump priorities. Petitioning on Trump issues. Attending Trump rallies. Wearing MAGA gear. Answering public polling questions in Trump's favor. Expressing support for Donald Trump on message boards.
Now some of these are more directly effective than others, but they are all forms of political support for Donald Trump. Maybe you're already not doing many or all of these.
And of course there is the opposite of political support, which would be political opposition. That is more what I was getting at with my question. Is there anything he could do that would cause you to actually oppose him - endorse his removal from office, vote against his preferred priorities and candidates, protest against him, donate to opponents, etc.