Humanity is cyclical and repeats. We go from prehistorical ancient nomads to what we are today, then a cataclysm destroys it all and we lose everything including our history, setting us back to primitive nomadic barbarians. Supporting this is the fact that we have developed everything we have from prehistory to now in <10000 years, an unbelievably rapid pace and short enough that all of recorded human history could be repeated numerous times. Whatever humans remain from that civilization try to pass on and preserve what they can and this forms the new foundation for religions, beliefs, and advancement.

Some of those people descended from the previous advanced civilization may exist concurrently with our society, and may be what we consider aliens/ufos/ect. They may contact and influence us. These things explain the ancient wonders and various archeological anomalies. I'd say based on our rapid development, we are crescendoing to the cataclysmic event. The most powerful truth is "there is nothing new under the sun"...in fact everything from hunter gatherers to the advanced technological society we have has been done many times before.

One fact that gives hope, and that i dont know if anyone has considered, is that anything we do can be undone...every wrong righted, every injustice corrected, and everything humanity ever lost regained. That which was stolen restored. Every evil punished. Everything you are, have done, and have experienced is recorded in your DNA. Using future genetic technology, the dead can be resurrected. The truth found out. Minds read. People can be judged. Death is no longer a permanent escape. Secrets can no longer be kept. Every truth revealed.
It is all encoded in your dna and hormones. We can bring back a caveman and talk to him. We could recreate Jeffery Epstein in his previous state through cloning, and convict and torture him for a 100 years for his crimes. This is what is meant by the final judgement described by religion. And it will come. For the just it would be a great joy, and the unjust would fear nothing more

Just my crazy 2 cents