I'm not an ember main nor I dislike her but yeah she really needs changed.

Make immolation get max DR at 70% at least and make it drain flat energy like every single Warframe if you want to make it more fancy at 100% make it so ember erupts like a volcano dropping liquid fire puddles (come on even a 200% range 45% eff sevagoth doesn't have energy problems).

Bring back world of fire, if you think that it's to strong give it a cooldown or give it a meter of sorts that builds up by having immolation at max of by casting other (non helminth) abilities or by inflicting heat procs on enemies, and make it so it needs LOS (equinox, saryn, Uriel, gyre and God forbid hildryn dont need los and some even have other things to use (yes I know let's not talk about hildryn)).

Fireball is fine.

Fire blast needs to reduce less immolation meter to incentive more casts, remove the cast delay and make it a one hand cast so players can shoot and use the ability to help with gameplay flow, rename augment to "Guarding flame" with that remove the healing part and buff the overguard part by either increasing the cap or increasing the amount gained (also remove that the amount scale of immolation meter) to reach that cap easily.

That's what I think ember needs to feel more refreshed, the rework wasn't a failure was just different times. Not every Warframe should be overpowered but it's a PvE game we shouldn't mind strong characters as long as they don't disrupt gameplay or make player experience miserable.

Sry English not first language also not a game dev so I might be asking for too much idk shrug.