I was a bad vegan

Hello! 22f I have been a vegan for about 2.5 years now. I started during my senior year of my undergrad! That first year I did well I still had a meal plan through my college and they had decent options at the cafeteria and I would eat a lot so I really hadn’t lost any weight or anything. Then I finished my undergrad and went straight into grad school. During this time I lost my meal plan, got severely depressed, and essentially got really malnourished. The majority of my meals were either toast with peanut butter and banana, avocado toast, or veggie burgers. Those were the easiest things to make with the littlest time. I never learned how to cook, and I didn’t have time to while finishing my M.S. During this time I weighed 100 lbs, lost all the life in my skin, lost all the fullness in my face, my eyelashes all basically fell out, so many things. It wasn’t until recently that I started taking vitamins (b complex, women’s daily, SAMe, vitamin c). With that said, I finished my masters program, I’m finally not depressed and I’ve been putting on weight. Im trying to be healthier and a good vegan now. I am just really worried that I have set myself back too far. I’m only 22 and I’m scared I look like I’m 30 because of how nutrient lacking I’ve been. Please recommend easy meals, more vitamins, any tips literally anything you can think of! I want to stay a vegan because I really believe in the cause, unfortunately I am just really bad at it! I was a vegetarian for my whole life prior to switching to veganism and never had any problems, genuinely would it be in my best interest to switch back until I can figure something out? literally anything helps! Thanks!