Knowing what you're worth and knowing what the market will pay are two completely different conversations. Most musicians confuse them and end up either undercharging out of insecurity or overcharging out of ego.
Neither works.
Here's what nobody tells you about pricing.
When a venue thinks your price is too high they don't hesitate. They don't negotiate. They don't email back with concerns. They just go find someone else. Silence is the market speaking. Listen to it.
But the deeper problem isn't price at all. It's positioning.
If you're just another act available for hire you're competing on price. And there will always be someone cheaper. Always. A woman who sings like Mariah Carey is a feature. Features get compared. Features get commoditized. Features lose to cheaper features. As Seth Godin says, “The problem with the race to the bottom is that you just might win.”
What gets you out of that race is a different question entirely. Not what can you do, but what change do you make in someone's life. If you can answer that, specifically and honestly, you're already ahead of most musicians.
The client who doesn't value the change that you seek to make isn't your client. Move on.