Check out these websites for more ideas to help you choose the right question to research:

This website has an overview of many science and engineering projects - Discovery Education and Home Depot are the website partners:

https://sciencefaircentral.com/

This website allows you to search by topic, area of science, or grade level. It can also recommend a project for you based on your interests or hobbies!

https://www.sciencebuddies.org/science-fair-projects/topic-selection-wizard/background-info

This website has a variety of ideas for projects, plus you can find links to science experiments you can try at home:

https://sciencebob.com/category/science-fair-ideas/

Check out these links for science fair projects organized by grade level:

https://www.education.com/science-fair/kindergarten/

https://www.education.com/science-fair/first-grade/

https://www.education.com/science-fair/second-grade/

https://www.education.com/science-fair/third-grade/

https://www.education.com/science-fair/fourth-grade/