By my maths (including Alaska and NC in the GOP column) President Trump needs 38 more electoral votes. The state's being sought after appear to be Pennsylvania 20, Georgia 16, Michigan 16, Arizona 11, Wisconsin 10 and Nevada 6.
This is unlikely to come down to a matter of states being flipped.
If Trump proves systemic fraud to advantage Biden then the state legislatures will be given all the mandate that they need to name Trump electors to the EC and the entire DNC is basically dead.
If Trump fails to prove systemic fraud then a lot of it has to do with timing. PA is his strongest case because it isn't a matter of fraud (like NV) but a matter of systemic failure to apply the law. If SCOTUS rules that the state legislature controls and none of the other state organs can rewrite election law then Trump wins PA because applying the plain language of PA election law, you have to toss half a million plus ballots that went to Biden.
It would also bolster the WI, MI, and Georgia cases as all of them have laws saying that observers from the parties must be allowed to observe or the ballot is presumed fraudulent. And again that results in tossing a ton of the mail in ballots (more than enough to flip all three states with their current margins).
But for all of these cases, you need SCOTUS to first decide the underlying issue before the other cases are decided. And December deadlines are coming up.
Trump really has four possible paths to win (in order of odds of success):
1) Prove that the electronic tabulation system was manipulated to advantage Biden across multiple states. If done this destroys the Democrats and all the Republican legislatures will just declare Trump the winner and Democrat protestations won't go over well at all.
2) Win the pending SCOTUS case and use the precedent to get tens to hundreds of thousands of ballots tossed in WI, MI, PA, and GA. The legal argument is very strong but whether the courts are willing to pay the political cost is the issue; because the fallout would be Bush vs. Gore but ten times worse.
3) Prove systemic election fraud of basically every kind sufficient to provide political cover for the states in question to simply refuse to certify any electors to the EC and get the case thrown to Congress.
4) Get the state legislatures/Congress to just declare him President. Legal but politically impossible without major political cover.