Why is beginning of act 3 almost impossible?

I'm just starting act 3 as my sorceress and I'm level 37, and the Sandswept Marshes feels impossible to get through solo.

Enemies are way scaled up and the map level says it's for level 33 but even at level 37 I'm struggling to do this solo.

Should I just keep doing dreadnought runs until I'm like level 40? I was not expecting to struggle so much just to kill the first few monsters in the area.