I think that perspectivism is the only honest response to the complexity and uncertainty the world presents
I disagree. Even within our limits we can craft and forge our future; at least we can try. That's not to say other perspectives aren't worth looking at, it's to say that in our day-to-day lives, we look for our own wellbeing, and we do it as best as we individually see fit. Show me a contrary example worth considering.
Your perspectivism seems crippling to the point where there can be nothing set in concrete, thus nothing is set in motion. Ideas are great, implementations are better, IMO.