I'm familiar with buttons to move up or down, effectively swapping positions. And draggable cards. Even multi-select of cards to move batches at once.
Is there any good experience once things get to, say, a thousand items?
I'm having a hard time thinking of anything more friendly than (or even comparable to) working with text in an editor..
Are there any interesting, potentially radical approaches that haven't yet become commonplace?
But honestly if you're expecting your users to manually sort 1000+ items that's a bad smell. I suggest you don't actually understand the problem you're trying to solve.