Did she peak in GOT? Seems like her career and popularity has dwindled

She was pretty great in GoT, fit the narrative of Arya 'Horseface' Stark, as written by George R R Martin, so it's tough to say how her career goes from here.

If only Double Dumb opted for 10-13 seasons with 10 episodes each as originally planned, she'd still be in a career today, lol.

Probably. There seems to be a usual pattern in terms of young actors who peak early.

1/ Peak.
2/ A lead role in a project that fails.
3/ Some kind of weird artsy film.
4/ Something more edgy and B grade.
5/ Long break.

GOT ended in 2019, she had New Mutants come out the next year along with 2 Indie movies, them we had covid and it shut everyone down, and she's currently right in the middle of making a Sex Pistols series on FX. Seems like a pretty full slate to me.

A has every other actor in GOT ... not because of anything they did or didn't do, but simply because it is hard to find anything that star in that is as good, hyped or widely viewed as GOT was. I think she will show up again in something, but these days there is a massive bank of actors all looking for jobs ... which is probably an improvement over always seeing the same few faces.

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Looks like it.

A lot of the GOT actors/actresses fall into that branding as well. How many of them have moved onto bigger and better things or at least stayed working in big projects?

Jason Momoa is the only one, but he was never a main cast member. Just a bit part player for 10 episodes.

Emilia Clarke had a few shots. A Terminator and then Star Wars film, not to mention a few Rom-Coms. But it seems her chance has went up into thin air. Not really her fault those films flopped. But I can't see her staying a huge deal.

I will say that Sophie Turner & Maisie Williams still have a chance in big roles. Given the fact they're both so young, they have a long career still ahead of them. All it takes is that one decent role in a surprise hit and they're back in business.

She's not dumb. she has been on the ground floor for a few apps. If one of those hit (very rare) she could be worth hundreds of millions. also, besides this she appears to be involved in a bunch of other ventures not related to the film industry.