I don't know what you're talking about re: hormones, but in general I think the best idea is to do both things, though I don't think the risk to humanity comes from damaging Earth, so much as damaging each other. Over the past 2 years I think we came far closer to nuclear apocalypse than most people realize. Certainly far closer than anytime besides the Cold War. And over the 2-3 years before that a global disease spread and seems to have infected basically 100% of humanity. And this disease was most likely created by humanity, and released by accident. We're only fortunate that it was relatively harmless compared to what it could have been.

Now that's happened all over just the past 4 years. What do you think of our chances 20, 50, 100, and more years in the future hold hold? It's pretty easy to see plenty of timelines where we do eventually manage to kill ourselves, and so expanding beyond Earth is critical. Of course that doesn't mean we should neglect Earth in any way, shape or fashion. But with 8 billion people on this planet, we can manage to do more than one thing at a time to quite a high degree of competence.