Know about the nature of tuning, avoid unnecessary efforts and focus on the essentials.
The Bansuri is an instrument that cannot be tuned. The Bansuri maker did this for you. But still the pitch can change dramatically by the way we play it. Still there is “a middle” to find, and then the rest needs to be adjusted accordingly.
Please watch this video and avoid the extra struggle one might end up in as a beginner:
Bansuri Hints for Beginners: Get in tune with less struggle!