Before the SCOTUS ruling in 2000, I think there had been recounts and I still remember the one poll worker with thick glasses trying to gage if the chad and been pushed out enough to count it as a vote.
The point was, after the SCOTUS ruling, Gore shut it down and moved on, the Democrats then began a campaign to completely change the election system.
Richard Nixon despite credible evidence of cheating in 1960 quickly conceded, came back in 1968 and won the next two elections.
Trump could have moved on and 2020, plotted his return and develop a strategy to overcome the problems in 2020, now the vast majority of his campaign money is used to pay legal fees.
The more time we talk about 2020 and not the complete disaster Biden is then Trump chances of winning go down.
For decades, albeit post Nixon's time, the GOP was further limited by a rotten consent decree which prohibited them from even trying to fight back. That only ended when the octogenarian lefty judge maintaining it finally died. Trump is not only the first Republican to try to fight back, he's the first in decades allowed to fight back.
Perhaps he could fight better, but he's figuring it out as he goes and and an awful lot of reasonable attempts have been summarily blocked by embedded forces of the left.