At least President Harris would provide a plausible fiction upon which relationships might begin to be repaired or at least a fiction upon which our allies can pretend to be with us.
Such a pretense is not to be disparaged, world leaders need rationalizations for their people and even cynical alliances are often binding in times of emergency because the pretense has been sold.
There are certain countries, Taiwan obviously among them, who are utterly dependent on American support for their security. Even though the leader of Taiwan has stated that Taiwan must now look to its own security, Taiwan has no chance of defending itself without America and Taiwan knows it.
There is an obvious example of a place to stitch back together a system of alliances to force China to have second thoughts.

....”Until Biden is gone either by impeachment, resignation, or 25th amendment,.....”
sadly, I do not see his leaving office through any of these measures.... yes, he may resign at some point, but unless and until he is forced to, this PoS of a President will stay on office for far longer than he should have.....