Frequently students ask me if I have a research project and if they can be a part of it. I used to do the same. However, the response that I used to get was pretty bland. Perhaps you also deal with similar response when you approach an attending. How can you change this response? How can you come up with a clever way to ask and be a part of the project? I did not know that and that's why for several years I was not able to find a mentor. There are few steps you can take to find a mentor.
https://gastro.org/fellows-and-early-career/mentoring/ (Gastroenterology)
https://kidney360.asnjournals.org/keyword/mentorship (Nephrology)