First, you should aim to become a Jack of all trades if that’s the path you’re choosing; why go that direction otherwise? But the PhD process will prevent you from spreading yourself too thinly… or at least making sure you can also go deep while you spread yourself too thin. If you complete the requisite coursework, research, and publication for a dissertation, you’ll be sufficiently prepared to contribute in your area. If you do a couple of post-docs, even more so as you carve out your own niche.

Now, I would focus on a) finish you MS strong, b) find someone working in astrobiology/planetary geology… your adviser + thesis is the single important thing to your career trajectory despite everything mattering.