It’s long been traditional that when a sitting President leaves office he (so far always “he”) retreats into silence for a year or two to let the new President have all the spotlight. IOW, no kibitzing.
Yes, the immediate ex- may be doing the lecture circuit, being a UN do-gooder, etc. But he’s affirmatively staying out of the day to day US news cycle. Note this has been true of both 1- and 2-term Presidents, so the silence is not merely about having no more worlds to conquer.
Let’s posit that Biden solidly wins the election, what grumbling there may be about fraud, unfairness, recounts, etc., quickly drops away, and the Presidency changes hands to Biden on Jan 20, 2021 as per normal.
Given Trump’s love of the spotlight, how does the next week, month, year look? Can he comply with tradition? Will he even bother to try? Or will he be a noisy gadfly all day every day?
If he does stay full engaged in the news cycle, what then? What can / should the sitting President do? What should the rest of the R party do?