What can you do if brainstorming only gives you a small or incomplete idea?

Hey there,
Probably your mind is overloaded with too much thoughts .You should actually go for a break for 15 minutes as it will calm you down and then you can start brainstorming. Now, the results will be much better. 
Or,
You can actually look the question up on google. Since google offers various websites of answers, you can check out a few and see which suits the best.

Hope this helps :))

~Top

You can maybe look up the question or something idk just stay relaxed while youre thinking and clear your mind. think outside the box.