I always picture creativity as a bank account, in order to put money in the account to then be able to use it you gotta deposit it first, right? Same goes for Creativity, you sometimes won't know what to do unconsciously and then you may think that you actually're just being lazy (And while that may be the case, it is not always), so you gotta consume all the time, music, videos, movies, series, books, comics, whatever, even going outside helps a bit, a change of scenery as they say.
Then at times you'll have to force yourself to sit down and draw, and that yeah, can be either because you're lazy, you are too distracted to even considering grabing your pencil and start doing a few lines at least. So... You can try get bored, turn off the internet, read something or do something that you don't like to do be it cleaning, folding clothes or just going up and down the stairs or walk around the house.
Some people actually blocks themselves because they have the idea that when they draw, they must do a piece, something with a start that they have to finish, something original, something with composition or whatever.
I believe that the best way you get to draw and then you find yourself actually drawing and making pieces, is when you're just doodling, making silly lines, or drawing eyes at the edge of your bullet journal, sketch or make lines without thinking about making them in ways that you would like them.
Sometimes what happens too is that, maybe your brain or body are just simply tired, too overstimulated and need to rest, you need to do something else.
And finally, it could be that you're brain is tired of the same process of thinking / steps which you approach when you draw. So changing the process could also help, be it make one single sketch then lineart, or making 3 sketches to finally achieve a lineart (rough sketch, defined sketch, clean sketch)
