List other things you learned. What you have learned may allow you to answer other questions. Many questions are related. Several new questions may have occurred to you while doing experiments. You may now be able to understand or verify things that you discovered when gathering information for the project.
Questions lead to more questions, which lead to additional hypothesis that can be tested.
No matter what happens, you will learn something. Experiments that don't turn out as planned are an important step in finding an answer.