Trying to be mindful of how our actions impact other lifeforms, and trying to diminish our weight on mother earth is imo an essential part of developing our conscience and evolving. Psychedelics can definitely help making us aware of how important other lifeforms are.
That being said, after 15 years of putting in practice this exact realization you are talking about (from ayahuasca though), while it makes sense at first to be "vegetarian" (or some people decide vegan), I'd definitely forget labels and just try to think in a broad way. It is a fact that meat is less sustainable, and that most meat industry is horrible and keeps animals in appalling conditions, so avoiding it in general is prob good. But, say, buying a certified 'vegan product' for example, but that comes from another country, shipped halfway across the world, with all the ecological impact, the wasteful packaging and etc that create directly and indirectly a lot of damage and suffering to other lifeforms too.
Or, say, being vegetarian/vegan but changing your cellphone or computer every couple of months, with all the impact it has with the mining of minerals like coltan, the production of phones in countries like China with very poor environmental practices, etc..
Or, say, you go to someone's house that in a small rural place where they just prepared specially for you a meat product that is traditional for them, and now you refuse it, maybe there is so much left-overs that now they have to throw away (so the animal's suffering is wasted), plus you created suffering for that human which is so dissapointed after spending hours preparing something you denied, which should count too right?
So, instead of fixating on a specific label (not saying you are, just saying some thoughts that come to my mind about this subject because ive thought about it for a long time already), I'd say just try as much as possible to avoid buying manufactured goods, recycle/reuse as much as possible, eat things that are in season and local, avoid plastic wrapping (bring your own bags to the market), avoid meat whenever possible, etc... Like a general attitude for all things in life rather than a specific named diet. At least that's how I see it
