Here are some of my own take-away truth claims I get from Genesis (not all (none?) of which are “merely” allegorical).
All of creation (physical, spiritual, universe, multiverse, matter, life … everything) was created by God.
Humans are given a special commissioning, among all the creatures, to function as God’s “emissaries” here - to steward it in ways that help each other and the entirety of creation better thrive.
Humans are granted the dignity of freedom and choice (whatever we may make of determinism, freewill, etc.) I believe (and here is one of those cases where I cannot at all adjudicate or defend this belief on any empirical level to you, but I tenaciously will believe it anyway) that we have enough of ‘freedom’ (whatever that is) to be held morally responsible for our choices.
Humans have largely failed to live up to these moral responsibilities. We choose to sin. We choose self at the expense of others.
There are suffering and dire consequences that people face and that much of creation (on this planet anyway) experience as a result of our sin.
God has chosen to continue to relate to and call humanity back despite our failing of the high calling given us.
God (in foreshadowing, or even one could say - the beginning of the incarnation to come), chose a special people to initiate this new eventual blessing to all the people of all nations.
The aforementioned people (or the story of their ancestors Abraham and Sarah at any rate) have a very specific and historically embedded redemption story of failure, repentance, failure, etc. that is already begun to be told before the final chapters of Genesis are concluded.