Ui made one meme song, she needs more to be ranked at the top. It's like throning PSY as the King of Kpop since his Gangnam Style has 5 billion views. But she does has the potential to if she made good use of this opportunity. Regardless it happened at the tail end of 2023 so any discussion about her needs to move to the next era/year.
Looking just at the numberfag side, in 2021-2023 era, the top 3 vtuber in viewership/accomplisment is Kuzuha, Pekora, Ironmouse. The 4th slot fluctuate depends on what kinda metric you look at, marine has better average viewership, koyori has more watched hour (since she just .. stream mores) and her highest view stream > marine, and marine song sees way more views.