如何设置圆形小平面包裹y轴的限制？

I have this plot and I need to round the y axis so what appears is acceptable EXCEPT for the fact that I would like to not just show 1 value on the y axis. I'd like to add the "limit" to the "scale_y_continuous" function so that the limits for each facet plot are unique to the individual facet.I have this plot and I need to round the y axis