From a foreigner's POV, here's my take on the 2024 election:
Biden represents a standard US foreign policy, drifting towards dovish. This is something the rest of the world can work with. It's predictable and won't exacerbate global stability. The US remains the top global player. Conflicts will come primarily from actors who want to muscle in on this arrangement, namely China and Russia. It would be more or less status quo.
In the US, Biden represents a gradual shift towards - to me - common sense progressive policies. Free health care or college probably aren't on the table for his presidency, but opinion keeps shifting towards those, and Biden won't actively hold those sentiments back. Basically, we're talking about a gradual shift in the right (as in, left) direction.
Trump is predictable in a different way than Biden. Trump will predictably always take the side of the worst major actors in the world, the authoritarians. We can expect a much more isolated US, with a retreat from NATO and probably the UN. This will leave room for authoritarians to grab what they want. It will play into Putin's hands, allowing him a much more aggressive stance in Europe, possibly leading to more continental wars and/or an escalation of the conflict in Ukraine. China will probably also take the opportunity to move towards Taiwan. Furthermore, a Trump presidency will likely completely scupper any chance we have to mitigate climate change, over time leading to massive migration waves crashing into Europe and North America. In summary, a Trump presidency (just based on what he's said and done in the past) would completely alter global power balances and be a major boon for autocracy over democracy world wide.
In the US, basic rights for anyone not in the major in group (straight and white) will be worse off. It's likely that the US justice system - imperfect as it is today - will be completely broken, administering justice according to who you are as opposed to what you've done. Basic rights such as bodily autonomy will go away. Moreover, the system of government will change. It will be much more difficult, if not impossible, to change the government. Loyalists will inhabit all important positions and they will act to preserve the administration. The opposition will find itself scrutinized by a weaponized DOJ. Poor people will have it much worse, and the rich will get much richer. In short, a Trump presidency will mark a massive, quite possibly irrevocable shift towards autocracy.
So, that's why you'de better not **** this one up. It kinda looks bleak right now, so start working harder.