Sorry...didn't see your response til now
I had tried gluing the step but it kept splitting afterwards, cuz it's the bottom one and I kept treading on the side. So I tried one more time and swapped it out for a step that's higher up. It's holding fine now and I have learned to be more careful to put my feet in the center.
thanks for your response and sorry for ignoring it. I have changed my settings to notify me when someone answers.