We should indeed anticipate the very real possibility of post-election turmoil and take proactive steps to do something about it right now. The Pledge to Safeguard the Election (https://www.thepledge.site/pledge-to-safeguard-the-election) attempts to counter electoral fraud by digging deeper into the grit of the electoral process to make sure that electoral officials follow the same rules that have been applied to previous modern elections.
Cast your votes on the House and local levels with this in mind and then follow through AFTER the election to make sure the normal process is followed by keeping pressure on electoral officials of all kinds at all levels. We need to act NOW during this election (which might extend until January under the worst-case scenarios). If mail-in ballots are challenged, the results are closer than expected and President Trump then begins to manipulate the electoral college or attempts to move the process to the House, we will indeed begin moving towards authoritarianism.
A fuller explanation for how to counter this can be found in the Medium ILLUMINATION-curated articles “Stop the Coming Election Crisis” (https://medium.com/illumination-curated/sign-the-pledge-to-safeguard-the-election-b4daae7efd93) and “Wake Up America! What if Trump Loses the Election and Really DOES Refuse to Go Peacefully?” (https://medium.com/illumination-curated/a-call-to-safeguard-the-election-3a81c9192071?