Having felt and acknowledged that life is beautiful, and questions about its origin are secondary, there is only one conclusion — you have found the answers to the main questions of existence. From there on, multiply the good and enjoy life.
Can humanity reach exoplanets without the assistance of a self-aware AI? Probably not. However, to ensure it always remains benevolent towards us, it's essential for us now to learn to live harmoniously and more adequately follow the principles of friendship and loyalty.
The causality of events post the Big Bang is clear. But if we consistently "move" backwards, at the most basic level of physical reality's existence, it should culminate where matter, as the "prime cause of the world", should not possess a reason for its existence and a cause for its initial motion. It simply exists just without a cause and possesses the opportunity to spontaneously evolve.
Every happy life holds a distinct value, and the more there are, the greater the value of life becomes. If you wish for life to be more valuable, create happiness for others and yourself.