i am pescatarian, but hopefully i can help.

i would check out hemp protein powder- i have not had it myself, though so i can't vouch for taste.

in your smoothies, you could also add a large spoonful of peanut butter or almond butter- also flaxmeal is a nice add in.

when berries are out of season, we buy frozen unsweetened ones

ETA: you can even throw a chunk of silken tofu in your shake for a nice protein hit.