As a pantheist I have been troubled by exactly what you describe and explain. I have come to think there is a spirit that thrives or fades according to local politics, and this spirit I'd like to call man's search for and aspiration to the good. I also think existentialism and aspiration toward the good correlate.I am not sure to understand your point here. I don't think pantheism necessarily takes to a position like "if we intend to live we had better try to guess what will be happening tomorrow", and possibly not even to the recognition that "something is happening".
Sorry if I have to conjecture here, and possibly misrepresent your thoughts, but frankly I wonder if you realise the consequences of pantheism. In my view, pantheism has a bottom line, that the world it is what it is and it can't be changed. If Nature is God and God is Nature, then you take onboard everything as 'godly', survival of the fittest, sickness, violence... up to injustice and subjugation of the weak/meek. I guess this is not what you stand for.
The idea may be expressed fancifully and psychologically as a battle within psyches between a good god and an evil god. The 'evil god' is not understood as nature but diminished freedom and lack of reason, and the good god is understood to be characterised by reason and freedom.