Okay, well let's start with firing, and let's assume since his bad advice was in march 2020 then any repercussions would happen within the next few months when it became obvious that masks should definitely be worn.
The two people with the power to fire Dr Fauci are the NIH director, and the president (via his power over the NIH director). In fact by summer 2020 Dr Fauci had earned the ire of the White House, but for essentially the opposite reason (this was when the White House was still trying to underplay the pandemic as not-that-bad, going-away-soon, it'll be an Easter miracle, etc). As such the NIH director aligned with Dr Fauci against the White house, and Fauci was seen as the "defender of wearing masks" or somesuch. For example, consider the following article:
I don't think it's impossible to have seen Fauci fired if that's how Trump played it politically. But it's not.
Consider the following:
> Trump, in particular, has openly disagreed with Fauci’s guidance on whether fans should attend professional football games in the fall [...]
> In recent weeks, as the U.S. outbreak has spiraled out of control, Fauci has urged Americans to wear masks and to practice social distancing. The White House, however, has refused to amplify his advice, and instead has escalated its attacks on him.
The white house was trying to stimulate the economy by reassuring people it's okay to go out and spend money. Attacking Dr. Fauci for not being serious enough about masks sends the opposite signal. Hence, Fauci became the "wear a mask" guy (as viewed in opposition to the White House). Thus, everyone forgot / didn't care that early on he was wrong about masks.
He wasn't exactly wrong, as not wearing masks was still the general scientific consensus at the time, right? It was a WHO guideline, if I'm not mistaken.
May I ask what exactly you were hoping for here?