Then how else am I supposed to appease both the volcano and plants goddesses at the same time?

Yeah Fallout 3’s main story is pretty much garbage. Spoiler warning for anyone who hasn’t played fallout 3 and wants too don’t read any further. You can skip a good chunk of the story if you just head straight to Smith Casey’s Garage. The vault below isn’t locked behind advancing the main quest, so you can just appear and start the Tranquility Lane simulation. From there you can go in the abandoned house and input the correct code to active the fail safe and bypass a good chunk of the main story if you really don’t want to play through most of it.

Sony really made the meme real, what a fucking world we live in