Could we make Galadriel level similar to how sauron levels? I feel like that is more in line with her unit supporting nature, it seems weird to have her as a more front lines hero in her dress.
I'm absolutely against it.
Not only does Sauron level up by 'external actions' not caused directly by him, since he has to recollect his Power via the specific tasks of his Servants, but also this specific system symbolises how Sauron consequently determines with his influence the power (and the very 'vital force' if we talk about the Nazgûl) of his minions.
As Tolkien writes in LOTR, once the One Ring was destroyed and Sauron defeated, every dark creature under his control was deprived of its strength, evil determination and will of fighting.
If we take into consideration Galadriel, that's not how things work regarding her Power.
Galadriel's (and Nenya's) Magic primarily involves the physical environment in which she dwells, turning it into a sacred and DEFENSIVE shelter, and, then, it obviously influences all the people living in there via the creation of a never ending quiet atmosphere of calmness and protection, inviolable by any ill will.
But, this doesn't mean that the Elves of Lórien inevitably depends on her powers, like the Servants of Mordor are subdued to the powers of Sauron/the One Ring.
And Galadriel herself is not necessarily and physically bound to the people she governs, neither does she need to regain part of her lost abilities, as her Power basically remained unaltered (or it was maybe even enhanced in the late Third Age) throughout more than 7000 years of permanence in Middle Earth