This is impossible.Everyone, no matter the winner or the loser, should be completely convinced, beyond a shadow of a doubt, that the election was secure and fair.
The core requirement of it is that everyone knows the facts and wants to believe them. Unfortunately, this is a world where there are anti-vaxxers, horoscopes, healing crystals and homeopathy, people who believe the moon landing was a fake, flat earthers, that 9/11 was a CIA (/Mossad) plot, that a secret ruler of the world lives in Denver airport, that we should go back to the gold standard. People can't tell you what the national median wage is, how many immigrants are in the country, they don't know the laws and sure as hell how the government works in any useful depth.
The supposed crisis of faith in the US elections does not derive from verifiable facts about how reliable the election was. It is the product of an orchestrated campaign to sow doubt in the reliability of the election, on the back of a general decline in trust in US institutions and the political process. It does not matter what measures you put in place to make an election more secure, if one party decides to aggressively argue that the election is fraudulent, tens of millions of Americans will believe them.
And when we look for proof of this, we need look no further than you. Your belief in fraud is in defiance of any reasonable evidence presented.