So everyone already knows this, but I felt like putting a fine point on it. I think I understand what Trump's plan was for how this election was supposed to go down.
Georgia was supposed to be solidly his, so that was in the bag. He was leading PA and had made the case that all mail-in ballots were fraudulent. But the "stop counting mail-in ballots" was no good while Biden was winning the EC, so he needed to hurry-up Arizona while he was still leading PA. The idea was to claim Arizona and then after claiming Arizona, just say that the remaining ballots were fraudulent (everywhere, or just PA, whatever) and have a simple straightforward message to claim that he won. This is why it was important that Arizona count fast, and why he was so angry that Fox had called AZ for Biden. Georgia started throwing a monkey wrench in that plan.
It's actually somewhat remarkable that the EC showed a Biden victory at almost every instant following Michigan and Wisconsin. If it hadn't, I wonder how much stink Trump could have made.
Trump's path to victory at this point requires a re-count overturning a result, or winning Arizona, Georgia, and a toss-out of PA ballots. Doesn't seem particularly easy, but not impossible.