How can revise the expected salary I stated to HR before the hiring process began?

I applied for software dev role at a company(startup) recently and then got a call from their HR. They asked me my expected salary and I ended up giving a response that was quite low.

Now, I’m done with 3 interviews and based on my interactions with the people in the interviews, I’m realizing I really really gave a laughably low amount as an expected amount.

What can I do here?

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