I'm still waiting to experience what this "flow" is... I would say the reason I get stuff done is because I don't wait to develop flow.
Instead I try and use what I call "micro-progress", where you try and identify the smallest thing you can do to move the task forward, and do it.
Maybe one day I will experience flow, but in the meantime I'm fine without it.
p.s. unrelated, but another thing I have no experience of is ASMR.