Hi there, your brother really needs to see a liver specialist. We are not doctors, just fellow patients. With numbers like his, he should not drink alcohol at all. He could try cutting out red meat, processed lunch meats, they are very high in salt, limit fried foods. Drink more water to help his liver work better. Don't drink.
The high level of his AST should not be over 33
The high level of his ALT should not be over 34
I hope you can get him some help.