It doesn't work that way.
In Lean Analytics, they talk about phases Empathy, Stickiness, Growth. Each phase requires a different metrics emphasis. Revenue doesn't make sense if you can't acquire customers. Referral metrics doesn't matter if you can't retain them. And so forth.
I like to merge "Pirate" metrics (AARRR) with the Lean Analytics phases thusly:
Empathy: Acquisition, Activation - Test with landing page conversions.
Stickiness: Activation, Retention - Test with weekly / monthly active use.
Growth: Referral - Test with shares, referrals, etc. (and is your CAC going down?)
Sorry to be blunt, but assuming there is a single metric that could matter regardless of stage is a misunderstanding of the use of metrics.