Find power users first vs Launch it first

Hey Indiehackers!!

First time posting and here’s the case.

We’re building an audio Q&A tool and almost finish our MVP (https://jupitrr.com). Our vision is to make it easy for ppl to create bite-sized insights easily; and our target users cover from creators, mentors, coaches to founders.

From our hypothesis, we think career coaches would be our ideal persona (more existing behaviour + personal branding + love audio).
Should we take time to validate our MVP with them first or launch it anyway to see if it sticks with other use cases?

Would be great to know what you all think! Cheers~