You have the obligation to declare the following month if you carried out operations above 30k as well. The obligation to pay depends on making a profit. 35k of operation (not profit). Just like the 20k on B3.

Here are some valuable tips to help you save on your 2025 Income Tax Return.
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In Brazil, tax evasion is a crime, so using cryptos for this would obviously give you a problem, so don't do it.
But if you want to pay less taxes or even zero reais and not have all the regular operations, write it down:
1 - I would try my best to negotiate in my job or work the possibility of receiving my salary through a company, to get away from the CLT and high taxes.