Roughly two months I received some very interesting insight.
The physical condition which leads to my Soul Light's final untethering from my physical body once I transition into "next life" will be an energetic breakdown in my Achilles tendon which will lead me "within a matter of seconds through the Astral realm into my new body."
The reason this will run down so smoothly is that doing the inner energy work during this life means that I won't need to do it after this life, allowing for smooth and harmonious transition in the most wonderful way.
In other words, the energetic breakdown in my Achilles tendon will be at the effect of my spiritual, psychological, emotional and mental bodies' readiness to leave, hence being in complete alignment with my Heart's longing.
So obviously, this is not revealing anything as to the exact 'When' and the corresponding circumstances, which is a good thing because I like the dance with Unknowingness. Yet when it happens it will be perfect and impeccable.
Truth is, when our choice of consciousness expression does no longer resonate with a planet or place, we will more strongly feel our guest status. "I am just a guest here on this planet." Naturally, when we are having our last lifetime on a certain planet, we will feel like a guest who is already heading to the airport for departure. Of course we still see the beauty in details and express gratitude for the planet, but there is a striking emptiness in us which sounds like the planet's preliminary Farewell, with our Heart almost exploding in anticipation for Destiny.
Until then, some decades will pass I guess.