This is what Trump should have said, back in November:
There is much about this past election and its reported results that is profoundly suspicious. We believe that fraud was a significant factor in the outcome and it likely changed the election’s result. However, suspicion is not proof. It is the nature of an anonymous election that it is very hard to validate its results after the fact. We have not been able to find proof that votes were fraudulently cast or fraudulently counted in sufficient quantity to change the result of the election. Therefore, unfortunately, Joe Biden has prevailed in this election, and he will be inaugurated on January 20.
I share your frustration and disappointment at this outcome. We came tantalizingly close. The polls projected that we would lose by a landslide, but in the end the election was decided by just 40 thousand votes in four states. But it is now over, and our primary concern now must be to ensure an orderly transition of power and continuity of government. We will not obstruct the transition process, nor will we take any steps to sabotage the incoming administration. Neither will I endorse any objection to the counting of electoral votes, as has been the opposing party’s practice in recent decades.
Moving forward, I call on Mr. Biden and the new Congress to enact legislation to create uniform nationwide standards to prevent fraud in federal elections. Future presidents deserve to come into office without the cloud of suspicion created by this past election.
May God bless America, etc.
We all would all be in a much better place had he gone this route, and indeed Trump himself would be in a better place. But I suppose the fable of the scorpion and the frog applies.