Designers, what do you do when a design just isn’t working?

I’m a design student hoping to help designers deal with moments when they feel stuck during the design process. I’d love to hear about your experiences: ● What field of design do you work in? ● What usually makes you feel stuck during the design process? ● How do you figure out what’s not working? ● What do you usually do to move forward? Real experiences and stories would be especially helpful. Thanks!