[quote=@Sho Minazuki]
[@Haruharara] I'm actually just not sure what's involved with becoming a pillar in the lore so I have no idea lol. That's it. 
[/quote]

Here is a page from the canon:
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Also I've found this that is apparently from an omake of volume 11 but I can't find a direct source:

[quote]"To become a Pillar, you will also need to defeat one of the Twelve Demon Moons or 50 demons."[/quote]
They can also inherit the title from former Pillars that they have studied under, if that helps you! Though ultimately it is up to our lovely GM of course.