With any routine under seven minutes (which is almost all of them), you only really need one thing: a good closer. And there are only two things you really need to know about a great closer. First, it needs to be impressive. That sounds obvious, but most beginning jugglers think “difficult” and “impressive” are synonymous. Your closer must look hard, but there’s no real reason it has to be hard. Secondly, you should intentionally blow your closer on the first two tries. If you get it on the first try it looks too easy, but if you “miss” it a few times it looks harder and builds tension.
A few of these tricks are very specific to unusual trades, but most of them are either obviously useful (use a potato to remove the base of a broken bulb) or contain broader lessons -- such as the juggling example. Well worth studying!