Here's the imo best guide on world tendency (and please note that that's different from character tendency which is also a mechanic).
Basically you are out of luck and will have to deal with it in NG+ . It's an interesting but ultimately slightly frustrating mechanic (like Demon Souls is famous for). One of the reasons why is that dying in human form pushes the tendency to black, and since killing the bosses (which pushes it to white) also gives you a free human form (add to that most people use human form for the bonus HP) it undoes most of that effect unless you die elsewhere like the Nexus. And the game doesn't make any of this clear.
There is another way through connecting to private servers, and I know the big one (Yuvi's) occasionally rotated the world tendency event so you could log in and out repeatedly to push it towards whatever pure world tendency the server was set to, but the status/event site listed here in the comments is down right now. You might have luck finding one or possibly setting up your own.
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Not really, although it carries over into NG+ so you can carry progress depending on what you're doing. You can't do invading black phantoms because you killed all the bosses which stops invasions for each "sub-level" and the private server isn't popular enough that that's a viable plan anyway.
Your best bet is to keep an eye on Yuvi's private server (or set up your own somehow) to see when the next pure white world tendency event is and then you can log in and out in that level a bunch to push your own world tendency event towards the server's. Or, and I don't know anything about actually using it, there is a save editor for Demon Souls called Demon's Souls Save Editor by Wulf2k which I believe has editable world tendency.
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I want do a question for who play the game, i have the tendency world on "Neutral", and already kill all bosses but now how i can do pure white tendency in Tower Latria?
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