lacking in will, desire, or passion
If you lack
will you don't want to
do a thing, if you lack
desire you don't have a
purpose and if you lack
passion you don't give a damn about the
results.
Those three are about and demand different things.
For will I would suggest to just do anything, at all.Go out for a walk, try to complete all the sidequests of a game, read just a chapter of a book.
Will is something that you build with time(and discipline in some cases), and sometimes you have to force yourself to just "move", "do something" rather than let yourself be stuck in place by your lack of will.To have will is also to be stubborn.
Anything is better than nothing.
Desire is very subjective so it is hard to give advice on it.My best bet is to make a short list of the things you like in life and of those pick one to follow up on it(for example, if you like to sing but lack the desire to develop your skill, go sing in the shower or do covers of songs.Maybe that will ignite your desire once more).You can also pick/go seek something you never thought you would want/do(a novelty so to say) and see if this doesn't help you get back your desire, as humans tend to like new things rather easily.
As for passion...I don't know.It probably will be the same advice as the other two, just go for something, hope for the best and wait to see if with time it will bring you what you seek.
build them to be very intense
You can try to "build them to be very intense" but they probably wouldn't last long.
We tend to go through periods where sometimes there are high and others where they're low, it isn't a fixed thing.
It's just like with happiness, you're never always happy, what you have moments of happiness that might be happening in sequence(until broken, of course).
Where would this factor into the Hierarchy of Needs?
I don't know what is this hierarchy, but I think that at least
will is necessary for survival, while desire and passion are less important, if we were to compare them.