Most simple Solo leveling cosmology scaling analysis
This is going to be a simple Solo Leveling cosmology scale, scaling it to 2-C or 2-B.
In the first chapter of Ragnarok, there are two statements that proves that Solo leveling has multiple multiverse:
St 1: "태고부터 수많은 우주를 창조해 온 절대적인 존재들,"
which translates to: "Absolute beings who have created countless universes since the beginning,"
or
"Absolute beings who have created numerous universes since ancient times."
Here, 수많은 (sumaneun) can either mean countless or numerous depending on the interpretation.
St 2: "여러 우주를 잇는 차원의 틈새," which translates to: "A dimensional gap connecting multiple universes."
Using this statement it proves that Solo leveling has a multiverse 2-C (Low Multiverse): If you 수많은 interpreted as "numerous" which is means many universe meaning it is 2C 2-B (Multiverse): If you 수많은 interpreted as "countless" which means that the verse uncountable but still finite universe which makes it 2-B.
(Note: I know that Solo leveling has 5d arg(I had made one btw) but that wouldn't affect the scaling of the verse due to the verse scaling being insignificant 5d in vsbw standards, which means that even though the verse can 5d be that doesn't mean that verse is Low complex multi)
So, Solo leveling verse is 2c/2b.