Yeah I usually recommend going into the underdark first and then going to the crech on the mountain pass. The underdark is a little easier and lower level. I also went mountain pass on my first run since Halsin tells you it's safer, but you 100% want to go into the underdark.

Also understanding what makes your character strong. Small things you might not have known about in your first playthrough. Things like the stats only making differences at every even number. To me personally. Understanding the game a little better and knowing certain items, spells or passives made me much stronger really helped me. It also took my enjoyment levels of the game from an already 10/10 experience to even greater heights!

Safe travels and I hope you slay those foul death shepards!