You can’t quantity or even know “objective truth”. We can get really close for somethings, but knowing objective truth is akin to being a god. At the end of the day, everything is a model relying on some axioms.

Inter subjective truth, however, can be reached and is what we rely on most (a dollar bill is a fancy piece of cloth, but we all agree its worth a dollar). It is reached through consensus making.

Gathering a consensus is traditionally done through government or hierarchy, ultimately leading up to a single human or single groups input as “truth”. This method has continually begun to disintegrate as communication tech gets better (printing press -> mobile phone internet).

So the solution, to me, is to create consensus systems that rely on the input of many - use the law of large numbers, economic incentives, and the kaleidoscope of subjective truths to reach the most accurate objective truth we can.