i found one can only draw his best if hes enjoying his drawings. Dont draw to be the best or to be a great artist, draw because you like it, because its fun. Youll draw more this way and get better. If you find drawing/art totally boring and you cant find any enjoyment out of it, then its not for you. It does get to a point where it takes some studying, a little problem solving, and quite a bit of spending hours drawing scribbles trying to think of somthing; but thats where you find the differnce between the artist and the person, the artist keeps going.
You probaly just need a break, take some time off from drawing, go outside. Come back when you feel like it.
"Astronomy offers an aesthetic indulgence not duplicated in any other field. This is not an academic or hypothetical attraction and should require no apologies, for the beauty to be found in the skies has been universally appreciated for unrecorded centuries."