Don't say Bold.org or any website that has millions of people using it that enter hundreds of thousands of scholarships just hopping to win.($100-500 scholarships at best). There has to be a site that is both open and transparent... possibly one that directs you to certain links (different sites) that are more in depth with a certain topic that you want to go deeper on, etc.
I use Fastweb and Cappex. These allows you to put things like your interest, grades, race, schools you are interested in, religion and other things to find scholarships that apply to you specifically. Scholly also has this if your willing to pay a monthly fee. I dont know if other scholarship websites have this feature, but these websites are the ones I usually go to.
Raise.me, Scholarship America, scholarships.com, Cappex, Collegeboard. Your best bet is to apply across a whole range of websites, even those that are crowded. You may apply for 100 and only get 2 or 3, that's just the reality of it. Make finding scholarships a part-time job, even in college, and you'll be good.
P.S. Beware of college scholarship sites that redirect you and force you to sign up on another website. You'll enter a scholarship but you'll receive promo emails and letters like crazy.
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I can not tell you of one but if there is one that someone knows about please let me know as well! Sorry.