I believe saying this to students can lead to a fixed mindset. Instead, I usually say, "Thanks for working hard on this problem. Do you have another strategy?" I would think that the other students will notice that this comes from efforts, not innate ability, and they will also try to do the same as the other students and work hard because success doesn't come from fixed talent. In the future, I would have the students who worked hard to lead the other students and give them advice on what to do and how to solve their problems.

What I usually do during morning work is advise my students that learning from mistakes helps our brains process more ideas and grow. And I always have students to avoid saying, "I can't do this. "Try to ask for help. In the future, I will show my students a short video about how neurons make connections in the brain that they can learn instantly and learn on time.