Vegan protein macros

How many calories are you eating, and what's your current weight/height? If you used to be getting 100g-ish protein as 30%, I'm thinking calories in the 1350-1600 zone someplace? How fast are you losing weight? That could be a factor in all of this. Too-fast loss for current size can cause the symptoms you're experiencing, too; and the protein you're getting is probably close to the RDA (which I agree is too low, BTW . . . but I'm not sure it leaves protein as the only possible reason for your symptoms).

Also, how's your fat level? Are you hitting the 30% of calories as a minimum pretty consistently? (I'm asking because a plant-based diet can shift pretty heavily toward carbs, at the expense of either or both the other macros, depending on personal eating style. Carbs aren't evil, but undereating any (or multiple) of calories, protein, or fat can have negative effects in the longer run.

Not that I'm disputing the idea that 15% of calories - especially if calories still that low, and if fully plant-based besides, is anything like optimal for your goals. It's too low, yes.

Briefly, your best lower calorie bets are soy foods (tofu, tempeh, natto, etc.) and legumes/legume products, and some grains or pseudo-grains can be helpful (e.g., quinoa, amaranth.). I recognize that seitan wouldn't be an option for you because you're avoiding gluten, though it's a good option for others. Prefer vegetables and fruits that have a little protein. Try to get not just that one big protein per meal, but also at least a little protein in most other things you eat. Less amino-acid-complete sources are not as beneficial, but can add a bit of help if you vary them over time.

Since you're using shakes and bars, I assume you aren't opposed to processed foods. There are many tasty and nutritious options along those lines, from legume pastas to pea/bean chips, that a decent protein sources, and that can add variety to eating. That's without even getting into the faux meat realm, which is another option. (I'm not a fan out of taste-preference, never having much liked meat in the first place, but many people enjoy them; and it's hard to justify a critique of "too processed" as compared with shakes/bars.)

In case you don't know of it, this is a good site for evidence-based advice (not imaginative advocacy) about vegan nutrition: https://veganhealth.org/ . There is quite a bit of information about protein and protein sources, including for athletes.

I do think eating fully plant-based isn't inherently healthier (though for most people, eating relatively more veggies and fruits - many more - would be healthier). (I'm saying this as someone who's 45+ years vegetarian, not as a shill for Big Meat, BTW.)

I'm also not saying fully plant based eating can't be healthy: It absolutely can. But so can omnivory, according to reasonable scientific sources, and the evidence of millennia during which human groups evolved eating animal protein. (Some recent advocates are claiming fully plant-based eating is more healthy, in some universal sense. It may be healthier for the animals, but it's not inherently healthier for the humans. Yes, it can help some individuals better meet their personal goals, in their individual circumstances. The recent Netflix "documentaries" are particularly cynical manipulations, and they make sensible plant-based eaters look intellectually dishonest, IMO.)

Absent a moral or ethical reason, being fully plant based (or even vegetarian) is not something I would recommend to anyone. It's a tiny little bit more complicated nutritionally and socially, and not inherently healthier.

What helped me with protein on lower calories was to regularly review my diary, looking for relatively higher-calorie items with little protein that I could cheerfully reduce or eliminate, to make room for other foods I found tasty but that had higher amounts of protein. Over time, the protein level improved. In maintenance (though losing a few more vanity pounds slowly on purpose), I'm exceeding 100g daily. Admittedly, I eat quite a few things you don't, but I'm pretty sure I could do it with your dietary restrictions if I had to.

Best wishes!