Have I ever considered going straight vegetarian? Yes, briefly, but since the main sources of non-meat protein seem to be mushrooms and tofu and I'm not terribly fond of either, I'll stick with my own dietary philosophy which I have named…
Grazing lamb
Nonmammaltarianism.
It means I'll eat poultry and seafood and other non-mammal meat (including, once, reptile) but not meat from mammals. No beef, pork, lamb, venison, mutton, etc.
This is not really a dietary or health issue except that not eating mammal means I'm not eating factory-farmed beef or pork. It's more of a philosophical thing: I don't want to eat anything that thinks. Cows and pigs are too close to people and I'm frankly horrified by how they are slaughtered for market.
Not eating mammal, especially pork and beef, does make eating out more challenging and I'm afraid it sometimes puts too much stress on others who will worry about picking someplace where there's something on the menu I can eat. To that I say: please don't worry. Even at a place like Incanto, which specializes in animal parts I wouldn't eat even if I were a full-on carnivore, there are seafood and vegetarian dishes on the menu.