Mainly shake and vape.
But most juices will benefit from a bit of a steep, think of it like marinating a bit of meat, after an hour it will be OK, leave it overnight and the flavour penetrates more, the flavours mingle together and work together more, and the end result will be a more flavoursome product, in theory anyway, there are plenty of marinades that you wouldn't want to leave for a long time.
What I object to is all the nonsense surrounding steeping, you're essentially just leaving the bottle in a drawer for however long it is until you remember its there, or your previous bottle runs low, whether you shake it, airate it, warm it, cool it, decant and mix it or sacrifice a dozen virgins in its name, it will do its thing just sat there all mingling together on a molecular level, different components oxidising, changing, differnt compounds working together etc etc
But much like a lot of things to do with vaping / coil making / diy juice, it's been hijacked by people (no doubt living in their parents basement) that want to make it seem much more complicated than it is, so they can fool themselves in to thinking they are some kind of mad professor putting the world to rights, when the reality is for a coil they wrap wire around a stick, and for juice making they squirt a couple of things in to a bottle and leave it in a drawer, I mean seriously, you're not trying to find the cure to cancer or how to send man to the edge of the galaxy.