It is not, once you are verified without proof of income, you will be given the basic limit.
The limit can be increased at any time during trading.
The height of the limit depends on the information and documents you provide.

Proof of the source of funds can be, for example, a pay stub, purchase agreement, tax declaration, loan agreement, etc. In the case of a sale of cryptocurrency, the origin of the cryptocurrency must be provided. It is also possible to provide a history of purchases on stock exchanges, etc.