There are many things the elders know that are worthy of testing. Their knowledge has come from generations of scientific observation. Present all projects to Elders to make sure that they are culturally appropriate. Teachers and books. Books have suggestions.
Teachers do too.
However, the ideas must perk your interest. This book is full of Alaskan science ideas and projects. Perhaps a few will exicte you. Identify a Question to Explore 2 Do-able projects. Ask questions about your topic that will lead to a good experiment.