First, I'd suggest changing the terminology from "retirement" to "work-optional."

Once that's understood, you want to reach that point as quickly as you can, subject to (a) enjoying the journey and (b) ensuring that your "work-optional" income is higher than your target standard of living.

To me, that means you shouldn't try to be uber-frugal to the point of suffering for many years, since that makes it really hard to sustain, and you never know if you'll even live to see the end of that road, so make sure you enjoy life on the way there.

It also means that you need to carerfully consider what you'd like your life to look like once you no longer have to work. Then, you need to estimate what level of ongoing income that requires. Finally, you need to figure out your mix of fully passive income streams that will enable that.