I had to turn to co-op just to beat Menacing and claim the feather/dust from there.

And Fearless is just completely hopeless for me.

Is my account bricked?

On Menacing (yes, just Menacing, not even Fearless), I can barely beat the Lava Dragon using Raiden, Chevreuse, Sara, and Xiangling. I can barely beat the Overseer Device with Neuvillette, Furina, Kaeya, and Charlotte.

I tried using Gaming, Diona, Jean, and Bennett to beat the Hydro Tulpa, on someone's recommendation, but it failed utterly. The Hydro Tulpa moves around too much to make the three circles viable, and even if I get all of the circles aligned, Gaming's Vaporizes deal nowhere near enough damage to chunk away the Hydro Tulpa's health.

What team should I actually try against the Hydro Tulpa, then?

This is making me feel very discouraged.

Stygian Onslaught is proving to be too difficult a roadblock for me. My C6 Neuvillette is of little use against these enemies (except for the Overseer Device, and even then, only if I get the RES down), and my C6 Eula and my C3 Raiden deal virtually no damage. My Furina being C6 is moot against these enemies.

I cannot even beat Difficulty IV.

What teams can I actually piece together to get through this?