Honestly, there is so much I would change…
First, while it isn't always the case, general rule of thumb is the more recent it is, the higher it should be, as more people were actually around to remember it. Obviously, there are exceptions (KYM-tan grew in popularity, Lez and Eypc, despite being gone for years, hold a fairly high place in the community memory)
Soyjak spam and "another wojak" should be way near the top.
I don't know that "locked galleries'" as a whole merits a mention, just some specific ones, like Cringeworthy and the Childhood ones.
Modern Don is at the top, but you should put Gorilla munch Don in there too, but much lower.
It's not just RandomMan, but his edited MLP Angel Bunny avatar. That, along with BSoD's BSoD pony OC like, have tags on Ponibooru. It should also be lower.
Do that many people really remember "Lucina's So Cute"? Like, it was popular at the time, but I don't many who made an account in the past two years would really have any idea about it.
Spambots should be near the top. The Korean Spambots are more appropriate at that depth, probably even a bit lower.
Belle Delphine's gallery should maybe be at the waterline. It's not really that interesting, old, or obscure.
Seriously, not to be rude but uh… like if that's what you're putting down at the bottom, you're going to need to double the depth to start even getting into the stuff I'm thinking of… Jamie Dubs, Riff Raff Suspensions, Mare breathing in Ammonia, Muffinlicious thought to be a girl, Mare being a Nazi (ironic), Comments before direct replies to comments were a thing, Mare being a Nazi (unironic), Blubber's Epic Brony Sniper Rifle, Advance imposters, Mod Loli looking like Bieber, Brorangutan, The internet can now find stars, the really obscure KYM-tan cast members, CAMOWAM.