There’s no fair thing. Not from your POV as a seller / service provider.
What you charge has nothing to do with you. Or if you find it “fair”.
It’s about what’s important to your clients.
If they think the work you’ll do will mean 500K to pay you and it’s acceptable to them, they’ll pay you (and you’ll take it).
You don’t say “Oh, I don’t think it’s fair (to me) because it might take me 20 minutes to get that done or it’ll cost me 20K or I’ll be happy with 7K because that’s what ‘I’m worth’“.
Your worth (in these terms) is irrelevant.
Why? Because they don’t care. Would they pay you “your worth” if you cleaned their fridge?
What they do care about is what’s in it for them. How they can make a profit out of it. If the price is acceptable to them, they’ll pay it, because it’ll be “fair” to them.
Remember, business is not about you —or your “story”. It’s about how you can help your people thrive.