If you are worried about Trump regaining power (and it should not be taken for granted that he won’t), then limit the very powers he (or anybody else) can wield as president.

The Petition to Safeguard the Constitution [https://alcris2.medium.com/following-is-a-summary-of-6be4d81a3ddc?sk=bf21c2a6b26ea78cf6761ede5d12a96c] insists that Congress pass very targeted, but vital legislation to limit presidential powers in the most critical areas in which it could be abused to result in authoritarianism. Americans need to get behind this legislation now during this session of Congress while there is still the political capacity and time to enact it.