It's worth remembering there are 8 states of world ranging from pure black, through to neutral and pure white.
this is a useful resource from the demon's souls wikidot wiki. You can influence world tendency whilst playing online, but be aware if you login to the server again it will automatically restore your world tendency to the server average (I don't know what this is today, back in the day it was generally light grey).
Pure White world tendency events are difficult to get without planning, as any death in body form will reduce world tendency, offsetting the bonuses from killing bosses, but pure black can be achieved by simply dying, restoring yourself to body form in that world and dying again over and over until pure black is achieved.
These extreme world states are tied to events throughout - new NPCs appear, small areas unlock and new items are available. If I were you I'd take some time to look at the pure white tendency events and pure black tendency events, and decide which, if any, you'd like to attempt. It's likely you'll need to start a new playthrough.
Additionally to world tendency, there is character tendency, which follows the same scale and is indicated as the human icon in the centre of the world tendency indicator on the main menu. Pure white increases damage and gives you access to some items, whereas pure black unlocks multiple assassination quests.
As you can see, this is a complicated subject and requires some planning if you want to try and access all the content. My advice is go for white worlds first and complete all 3 stages (because worlds start slightly closer to white than black on the server, usually), and then manually turn it to black by dying in body form 7 times. Of course as previously mentioned, all of this works best offline to avoid risk of the server resetting the world tendencies, so if you'd rather join in with online events until then and tackle this at a later date! (Also, there is a useful method of item duplication should you want to complete everything in a playthrough, otherwise restoring yourself to life without a supply of stones of stones of ephemeral eyes is painful and tedious to say the least, but I won't spoil that if you would rather not).
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