Trump's first strategy for autogolpe was "Stop the count!!!". It failed.
His second strategy was to sue to have votes thrown out. That is in the process of failing.
So what are his remaining strategies? I can think of three...
That's doomed to failure, since electors are very hard to persuade to flip, Biden's lead is quite large, and many states have laws against faithless electors.
But even if Trump were brave enough to do that, there's no way that would succeed. The military won't have it.
Try to bully GOP-controlled state legislators into seating fake electors instead of the ones chosen by the voters. https://www.politico.com/news/2020/11/11/the-completely-insane-electoral-college-strategy-436156
The Constitution theoretically gives state legislatures great power over elections, but that’s not a reason to precipitate a constitutional crisis.https://www.politico.com/news/2020/11/11/the-completely-insane-electoral-college-strategy-436156
I think he'll still try it, because has to try something, and this is the only thing he can try that won't obviously and quickly end in failure.
Also it uses the only real tool in his arsenal: Bullying Republicans into falling in line.
Tanks-in-the-streets requires him to bully the military, which he can't.
Lawfare requires he bully courts, which he can't.
But elected Republicans? Those he can definitely bully. So he will.
For months, there has been talk swirling that if Joe Biden wins Pennsylvania, Republicans in the state legislature could bypass the popular vote and appoint electors who are favorable to President...https://pittsburgh.cbslocal.com/2020/11/10/pa-electoral-college-popular-vote/
So it's not just PA we have to worry about here.
1. If it fails it will not fail immediately
2. It's not 100% guaranteed to fail, given the vagueness of election law
3. It only requires bullying elected Republicans.
In fact, Lindsey Graham and Ron DeSantis have already been kinda-sorta calling for this. https://www.politico.com/news/2020/11/10/pennsylvania-gop-rallies-trumps-defense-435864
And if it fails, the autogolpe fails.