Stop eating processed meals and make a variety of dishes
Relying primarily on processed meals is a major error that many vegans make. You should avoid doing this. Keep in mind that just because you're a vegetarian doesn't mean you can stuff yourself silly by consuming vegan processed. You must still make an effort to maintain a nutritious diet that includes whole grains, fruits, vegetables, and nuts. That's what really helps your muscles.
Don't forget to take the time to mix up the meals you eat and make more various. You can easily eat the same thing repeatedly when you're a vegetarian. If you can, try to stop this. There are so many delicious vegan dishes that you haven't found. However, at first, making sure you eat a variety of foods helps you avoid nutrient deficits and gives your body additional nutritional options.