You cannot simply turn to the question of grounding, the trajectory of the current of understanding of which you are a member insists on approaching its own self-grounding as the full-fledged blossoming of the reflexive autonomy which it pursues with unshakeable rectitude. If this succeeds it then it leads to post-human nihilism. At the same point it may also realise with horror its failure and groundlessness. Only then can there be such a turning, but it needs to have exposed with ruthless honesty every twist of thought that has led it to this point.