Trump works from a position of strength, while Biden (and a lot of Obama) were from a position of weakness.
My issue with Trump is that he can overplay his hand. And his recent wins emboldens him to take bigger risks. This is not a Trump thing. Anyone who has success will take a bigger risk next time.
As of now, he's gone after some pretty weak and vulnerable targets. But when he hits against Iran, North Korea, or Russia, this is different. They are either not reliant on the US (Iran, NK), or have the means to retaliate (Russia).
Is Trump an unreliable partner? Yes in the sense that he doesn't like being taken advantage of. So if your definition of "unreliable" is not always there no matter what you do to the US, then yes. Players can not rely on the US to be there under Trump. But how far will the US go? Will they not defend the UK from Russia? Let's be real. Of course it will.
But in the end, getting European countries to better defend themselves apart from the US is a good thing in the long run.
So is war more or less likely under Trump? Well, compared to Biden, certainly history shows that was is less likely. And Harris would have been as weak as Biden, so I would say we are better off with Trump.
Russia is scared of Trump. China probably doesn't know what to do about him and believes the US is far enough away not to really worry about it, though a nice Trade War can change things.
As I said in another thread, the US is not planning to annex Gaza, and the US has said they aren't sending troops there. So the US will hopefully not get into a war in the region. Why would the US want to go into Gaza when the Israelis are better at knowing the place anyway?
So we'll see.
Certainly the world is trying to figure out what to do about Trump.