The legal intricacies are interesting, but like a magician uses redirection to divert people's attention away from what he's really doing, Trump's endgame has nothing to do with this lawsuit or any other.
Trumps endgame is to raise money. He is dragging this out, not because he can't accept defeat, not because of fraud, but because he is raising large amounts of money. All of his antics are about raising money for his own purposes, probably to help pay off his campaign debts and secure his position as a power broker, which he can further use to make more money.
Imagine if he had graciously conceded defeat weeks ago. Would anyone have given money to a billionaire loser? Of course not. But Trump concocted another lie that he's used to solicit over $200 million. He's spent less than $10 million on lawsuits, so he's found a new business with 95% profit margins that merely requires him to spout nonsense, something he excels at. Why would he want to conceded defeat and stop that money from flowing in?