What makes you unconvinced/ what do you advise over protein powder? More meat consumption (including organs)?
Discussion
I'm not convinced we need very much protein. Mentzer went high carb, mod protein, low fat. If I remember correctly he ate less than 100g of protein.
Get your micronutrients in (liver, oysters, egg), get some (ideally gelatinous) meat in, then consume high quality carbohydrates.

