I don’t think the game is over.

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“Would love to actually see anti-matter” - are you being literal here? because that would require a vacuum between your eyes and antimatter that emits at a visible frequency. Not entirely impossible, but detection and recording of an anti-hydrogen transition wavelength is more easily achievable. This might be no more than an LCD display indicating a non-zero number though. Exciting for sure, but not necessarily a visual spectacle.

I updated my answer. My challenge here is to write a rough understanding, without using any technical jargon (necessary for accuracy).

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Imagine a material made of groups of atoms, each group having an arrow.

Ferromagnetism: If the material is in a magnetic field, all groups and their arrows point along the magnetic field.

Anti-ferromagnetism: If the material is in a magnetic field, half the groups and their arrows point against the magnetic field such that net magnetization is zero.

Altermagnetism: If the material is in magnetic field, the groups may orient along different directions, but their arrows still align such that magnetization is zero.

I am not yet aware of reading material as you suggest, but I have just posted in here the simplest explanation I could make up myself.

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Not really: ferromagnetic, anti-ferromagnetic, and altermagnetic. Electromagnetism covers the entire field (pun!) generally.

Observed galaxy rotation doesn’t fit the centripetal force equation (classical Newtonian mechanics). You are 100% free to make any new equation that fits observations, as well as the rest of useful physics equations. Dark matter is simply the best explanation so far, but not a barrier in any way to better ideas.

Every 15 minutes, I change, do an hour of cross-fit, take a shower, change back to work clothes, and get back to work.