ASB solution:
Yellow Turbans ISOT to the Warring States, leading to them allying with the Chu who proceeds to unify China
A Yellow Chu if you will~
As for the best Non-ASB solution:
I think the Yellow Turbans winning is a pretty awesome way of "restoring" Taoism to it's place in the Sun, the whole underdog rebellion aspect of it makes it much cooler than the Chu winning(which was already the most likely scenario, they were the largest and most powerful state) providing much more narrative potential to explore as well as the fact we know more about that time period than the warring states, making it easier to research and develope
So I'd say it makes for a better story
Now if you want the best case scenario for Taoism I think going with the Chu Victory is the better option
With that you avoid the whole devastation brought by the Qin's Legalism, expansion of the state's control over chinese society and centralization on a sole ruler
By the time the Yellow Turbans happened all of these things had happened and Confucionism was very entrenched
With the Chu winning you'd butterfly away all of that, having social structures dictated by the Chu & it's taoist philosophy who'd end up as entrenched as Confucionism IOTL as THE ideology of the chinese state & society
Besides how else could you call the
Middle Kingdom Chuna?
