Say, given a site, create a password as:
HardcodedChars+siteName+len(siteName)+symbolInKeyboardOf(lenSiteName)+len(TLD)*N+hardcodedChars
So gmail.com would be something like
Chad1Gmail5%9Foo@
And then use that algorithm for generating all passwords.
Wait was it "TransferWise" or "Transferwise" or "Wise" or "wise" or "transferwise"?
I don't hate the idea, but what happens when you stumble upon a website that does not accept % in passwords, or needs less then 8 characters or one of the other random things that do exist? Then you have an algo for this, and a algo for that, you end up back at the same place.
What happens if you lose your KeePass file?
What happens if your password manager service goes out surprisingly, or gets hacked and someone deletes their DB?
What if, what if...!
You lost 99% of people here.