J.B.
I agree with Riley J on the volume. Be thankful that it's not like it was 20 years ago, before the internet and computers made finding and applying for scholarships a breeze. Back in the stone age (early 1990s) when I was applying for scholarships, I had to go to the library, thumb through giant scholarship directories, mail letters to the various sponsoring organizations asking for forms, type each form individually, and then mail back the completed form along with an essay, letters of recommendation, a copy of my transcript, etc. to each organization. Painful - I did about 30 applications my senior year in high school and stopped there. I did get substantial scholarships from my university and a few smaller scholarships, but I do wish that I had taken the process more seriously and applied for more over the years that I was in school.
So if I were you, I'd literally apply to 10 or 20 a month. Have a friend who is a decent writer review and edit your stock response. Write something that you can tailor to each application pretty quickly (like writing a cover letter for a job - tailor the beginning and end but leave the middle pretty much the same from document to document). Treat this like a part-time job where you carve out some time each week to work on applications. Ignore the "no" responses and just keep going.
Also, how good are "good" grades? You may be competing with students with 4.0 GPAs for the bigger scholarships. For bigger scholarships good grades don't cut it, top notch grades do. So you may have to go for many smaller fish instead of a couple of big ones if you're grades are good but not top-of-the-class good.
Best of luck to you and keep plugging away.