Links to Science Fairs you can apply to
https://student.societyforscience.org/regeneron-sts
https://student.societyforscience.org/intel-isef
https://www.jshs.org/
http://www.biotechinstitute.org/go.cfm?do=Page.View&pid=89
Various Science Competitions Links:
https://cty.jhu.edu/imagine/resources/competitions/science.html
https://admissionsintel.com/12-of-the-nations-most-prestigious-science-competitions-for-high-school-students/