I have a few recommendations, first its great that you qualified for a grant, in that case you should be able to get a Stafford Subsidized Loan in case the scholarships don't work out.
About- about scholarships, contact the financial aid office at your school, they want to help you get funding (obviously, so you can give it back to them at the school) and will know about scholarships in your category. Based on your GPA, it may mean that you need to apply for other types of scholarships besides merit, look for need based scholarships, and scholarships based on your major.
I would not recommend looking through huge scholarship search engines, but rather look through smaller local sources, such as high school websites will often post scholarships under the counselor page. Many of these are more local, and you are more likely to get them.
I would also recommend learning more about your scholarship and student loan options, you can do that at www.scholarplan.org
It may be good to see if you can get a on-campus job during school, if your not working already. Best of luck!