I should be writing...

Even in the house it was LOUD.  Probably the loudest thing I have ever experienced but at a normal, predictable interval.  You would begin to time your sentences with little pauses with the rest of the lighthouse crew so you would talk like this while making your………..HORN…………. tea and then carry on talking because you knew when it would go off.  It rattled the walls and the dishes in our cabinet.

At least one girl had died there. They kept photos of her everywhere “in honor of her sacrifice” because she had decided to take the winter watch alone and died in a storm where bounders the size of mini vans had been lifted out of the ocean and left scattered across the island, to say nothing of the ice chunks.  People weren’t allowed to be alone on the watch after that.

One day a dead moose washed up on shore and it took my entire crew all day but we managed to rig up a line to hang it up to dry because we thought having a moose skeleton in the house would really spice the living room up a bit.  It did.  Weird shit happens when six of you are left alone, like ALONE ALONE, no cell reception, no wifi, just a radio to contact the real world and not a lot of reason to do that.  People don’t go on lighthouse jobs if they want to stay connected, I’ve found.

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write insane shit that’s way beyond your perceived ability and skill level even if you don’t finish it even if you think it sucks

Alaric sat next to me without a word; this time, the silence between us was fraught.

That semicolon usage is technically correct: it links together two related independent clauses into one sentence (just like that colon links up the two clauses of this sentence, and the parenthesis turn this last part into an aside!) Technically speaking, there would be no need to change that sentence. If I was doing a straightforward proofread, I'd probably leave as-is. But! Compare to:

Alaric sat next to me without a word. This time, the silence between us was fraught.

That full stop distills the information into a double-punch delivery. First punch: he sits down. Second punch: the silence is fraught. The quality of that silence, its fraught nature, has been subtly elevated from the surrounding text, which emphasises it far more than when it was attached to the previous clause by a semicolon. If you wanna expand more on that silence, you could stick a semicolon back in:

This time, the silence between us was fraught; if it stretched any further, it was going to snap back on me like a suddenly-released tape measure.

That shifts the focus a little more onto the latter clause. Now it's not just about the fraught silence, but the effect that the silence has on our narrator.

You get something similar with the difference between clauses separated by commas, em or en-dashes and parentheses. As already demonstrated, parentheses are the textual equivalent of a stage whisper (sotto voce, if you will). Dashes are powerful tools for creating both on-page and mental space around a specific idea, thought or action.

It looked at me with its eyes – all six of them – then slid noiselessly back into the black water.

Dashes there emphasise the number of eyes. Maybe that's important because it means the water creature is giving the narrator its full attention suddenly, or maybe you just want to emphasise that this thing has six eyes – point is, those eyes are now the focal point around which the rest of the sentence's meaning coalesces.

You could use commas in that same sentence and be technically correct, but the feel of the sentence would be pretty different. Commas create minimal interruption to the flow of information so they don't create the same amount of information. They're like gently driving over a slight speed bump straight to the next thing, whereas dashes make you stop the car for a moment and look at the view. If that's the effect you want though, then commas are perfect!

All the frogs.

something that somehow 'innately' or 'genetically' predisposes vampires to be Goth, like some kind of sensory change that leads to a difference in colour perception (only blacks and dark jewel tones tolerable), preference of textures (e.g. lace and crushed velvet suddenly very appealing?)

is anyone like "oh my god, have you seen Raven? she's been wearing nothing but cream and beige lately..."

"I hear she's going by 'Barbara' now..."