If you have been a meat eater throughout your life, then it is probably a deep habit, and strong habits can be hard to change all at once. Since you have already tried that and it didn’t work, why not try eating smaller and smaller portions of meat. Some people find vegetarian meat-substitutes can be helpful too because they have become quite good at imitating many of the flavors and textures of meat. The main thing is not to make this a point of stress and self-recrimination. That struggle will do more to set back your spiritual growth than your diet. It is enough to have an easy intention to phase into a vegetarian diet, and to take easy steps in that direction every day. Don’t feel guilty or upset with yourself that it doesn’t happen instantly. Give it time and be gentle with yourself. Also, as much as possible, pay close attention to the taste and flavor of everything you eat. Don’t eat unconsciously and compulsively. When you notice you are not hungry any more and your body tells you it is satisfied (your body, not your mind) then stop eating. This process of conscious eating will also make it easier to change your eating habits by retraining your body to tell you what it really wants to eat.