There are so many different ways to do this its not funny.
Depending upon which version you are using and which view (edit or MT) you are in.
1. You could put a compressor across the track in MT
2. You could lower the loud verses with clip envelopes and then turn the entire track volume up to compensate.
3. You could apply a track volume automation lane
4. You could destructively edit the 4th verse by amplifying the volume in edit view.
If you need more info let us know which version and which view you are working in