I'd drop Dormant Volcano. It's strictly worse than a mountain.
Just a little note,
Dormant Volcano isn't
strictly worse than a
Mountain, just worse in a lot of ways. It is useful in a few ways, though: Effects that untap lands give double the mana for the price of one when untapping
Dormant Volcano (not super relevant here), and it basically gives you an extra land drop because it takes the place of 2 lands (relevant here, as mono red has difficulty hitting land drops, so
Dormant Volcano pseudo-giving an extra land drop could be important).
I agree that it should probably be cut, but I'm just letting you know what "strictly better/worse" means so you don't use it wrong.