There was a large difficulty spike between season 2 stuff (sigma sector) and season 3 stuff (axion plains). I have no problems doing 400% invasion missions or sigma sector hard, but axion plains hard I have to run away unless there's a second person. Unless I'm mistaken, it also says there is no normal difficulty axion plains. The people who have been playing forever probably didn't mind it since they were strong when it came out but I just started like 2 weeks ago so my main characters are still shallow in the arche tuning boards and don't have their arche level 40 unlocked extra module and a few other things.
I did get to do 2 wall crashers, but I could tell I wasn't actually doing much damage, I mostly debuffed it and revived people.

Looks like I'll have to do a training montage and get powered up.

One issue I'm having is weapons. When I was playing Freyna, guns like the Fallen Hope and Secret Garden scream "equip me on Freyna" so gearing was obvious and simple. But now that I'm playing Viessa, I'm not really seeing anything that is so obvious. I like the Albion Cavalry Gun because it has a frost attack and I like stunning stuff, and Clairvoyance actually reduces the target's frost resistance so that's an easy one, but neither feel as good as Freyna's weapons. Hell, the entire character doesn't feel as good as Freyna. I feel like I'm doing more work for less damage. Freyan just tosses a poison grenade in the room and watched everything from one corner to the other die, while Viessa has to run around with short range and cast 20 abilities, and it's not really faster or better, it's just more effort lol. Maybe I'm missing something since I'm a new player and don't know every trick in the book yet but from where I'm at, Ult Freyna is better than Ult Viessa so far. Both inherently, and because one has guns practically tailored for her. But Viessa is cool (no pun intended) while Freyna is mean to her allies so I decided to switch.