Based on the overall feel here in USA, what Trump seems to be doing is just to rally his base around him and project him as the guy who did not lose but as someone from whom victory was snatched. There is almost no chance in the Republicans overturning the results in their favor. The margin of victories for Biden in the crucial states are pretty significant and there is no possibility for Trump to reverse it. Even if he pushes all of them into a recount, he could gain a few hundred votes only (most likely).
He could also be doing this for the Senate runoffs in January. If Dems win those two Senate seats that are heading for a runoff, then they tie the Senate thereby making Kamala Harris (ruling VP and a Democrat) the tie breaker. It is massive and with a House majority to also have on their side, Democrats have no blockers in passing reforms that Republicans don't agree to. Trump will have to keep his rhetoric until the runoffs are done and Republicans claim those two seats, giving them a slim majority in the Senate and thats where it becomes challenging for Biden and team to pass significant reforms without using the executive order power (which opens them up for lawsuits).
Given how executive orders have been passed almost freely in the last four years by the current president, would it not be the same for Biden if he chooses to do so? At the very least he could reverse all of what Trump has done.