From a grander geo-political perspective at this stage there is very little that a Biden presidency would be able to change or undo. The Trump administration recognized certain domestic and international realities and rapidly accelerated the decline of "Pax-Americana". Whether this is a good thing or a bad thing is anyone's guess.
But no one can doubt that America has begun a series of retreats from the international world order. Our European allies are now dealing with the harsh realities of what a pull out of US military support means for their own societies – and how it would greatly effect their attitudes domestically, and internationally. You may start seeing an end of the guilt-culture of Europe, a massive break out of unrest due to lowering welfare standards, and an emerging nationalist attitudes that may be fueled by the coming refugee crisis out of MENA.
Instead of having a prominent guiding hand in the Middle East the Americans have stepped back, letting the powers in the region take over more – which due to some geopolitical realities (Iran vs Arab Gulf States + Israel) and the soon to be emerging massive water-wars (Egypt vs Sudan, and Ethiopia, Turkey vs Iraq) have created a new political order. That there is a massive domino effect of Gulf-Arab states lining up to normalize relations with Israel isn't entirely due to their animosity towards Iran – it has, in my opinion, more to do with the emerging water crises that these countries will have and the necessity for Israeli water technology.
Where America's over-seas interests may lie is in the Pacific, primarily as a buffer against Chinese expansion. It is here that I think that Biden may try to alleviate some of the economic pressures but would probably hesitate as anyone who's savvy enough to understand the massive anti-Chinese political consensus in Washington today. Ultimately, on this front very little will change.
I doubt that Biden would have the political will or backing to expand US forces internationally. The so called "neo-liberalism" or "neo-conservatism" era of US politics is waning down. This doesn't mean that the US isn't a great power – it just means that we are less and less likely to play policeman. I think, on this issue, the overwhelming vast majority of Americans across all political stripes would agree to.
Even right now, major conflicts are emerging and the US putting no real say into the situation. Or involvement. The Armenian Azeri conflict (full on war if you ask me) is primarily involving Iran, Turkey, Russia, and a whole slew of mercenaries.
I cannot imagine a Biden presidency reversing course on a lot of Trump's international actions. They would be domestically untenable. If anything, he may actually carry out, if not expand on Trump's international doctrine (though never admit to such), just as the Obama years expanded on the Bush doctrine.