so I am more than 5 years vegan and did competitive track most my live. The answer to me was just eat more. If you want to grow bigger, just think about how you can incorporate chickpeas or tofu into anything. I have the same breakfast everyday, so it made sense to me to measure everything once, to just have an overview how many calories and other macros are already in me at the beginning of the day. Huel also helped me, when the lunch in the university cafeteria was a little small, or the vegan option was only soup

Maybe also try a Base Metabolic Rate calculator in order to assess, how much calories you generally need, in addition to your workout calories. All the best on your workout journey