@Marcos *********
You spent two years in Thailand during a pandemic, this special time went with certain extra rules, which have been discontinued after Thailand opened for travellers, again
As a Brazil citizen, you are participating in the visa exemption scheme, you will be allowed for 30 days admitted stay, which you can extend ONCE on Immigration for 1900 THB fee, for another 30 days.
For Tourist visa (for a stay longer than what you can get by visa-exempt entries) and visa-exempt schemes, no more health insurance requirement are in effect, no more โThailand Passโ and Covid19 checks.
However, as others here have emphatized โ you should not travel abroad without a travel insurance that will cover fully any medical treatment and hospital stays due to illness and accidents