vegan

Not vegan myself but aspiring to be, been vegetarian for years though, and very into weightlifting. But the research around protein is generally consistent and metaanalyses support them: around 1 g per lb of body weight per day will maximize muscle growth for most people. However, for many people 0.7g/lb is sufficient; we all utilize it with different levels of efficiency. Others continue to find benefit at even higher levels than 1g/lb though. I personally stick to the 1 g/lb rule because with plant proteins I generally dont get my full amino acid recommendations from less than that. However you will still build muscle with less protein, it will just take longer. Protein deficiency doesn't generally kick in until your levels are really low, like <50g/day sustained type of levels.

Make sure the rest of your nutrition is dialed in as well though, calories in aggregate are as important as protein. If you're accidentally in a deficit when you're trying to bulk, you'll likely lose muscle no matter how hard you train or how much protein you eat proportionally, unless you have fat to burn to fuel that growth. And vice versa, an accidental surplus can harm your body recomposition if that's what you're going for.

I know some of the recommendations seem outlandish. I'm a naturally skinny person and once I started tracking my food I was shocked by how much I was undereating for my goals, and how much less protein I was getting than I thought. I was ~130 lbs when I started getting into fitness, now closing in on a lean 180. The recommendations are accurate, you need a lot of protein, and a lot of food to bulk up (hardest part for me is eating enough to even get to my surplus tbh)

Editing this to clarify: this is to maximize growth. You do not need to hit these levels in order to gain muscle, but to gain the most muscle for the work you do. I like to optimize my diet and exercise to get the very best outcomes, it is fun for me, but i know many don't find it enjoyable or healthy for them. You can keep those numbers in mind and set your sights wherever is most realistic for you. Less protein might mean a tradeoff in growth rates, but more protein might mean tradeoffs in your preferred diet and budget for meals etc. These questions are deeply personal and driven by your individual goals and situation.