Rapini is a green cruciferous vegetable. You might call it something else. Supposedly that type of vegetable is helpful for people who want to suppress estrogens. That type of vegetable also tends to have lots of lysine (relative to other vegetables or to the calories they contain).
I’d be surprised if you didn’t eat enough protein. More likely, you’re not eating the right proteins.
I realize it’s not that hard for adults to eat a healthy vegan diet but it’s harder than for non-vegans. And it seems quite common for vegans to have deficiencies in practice.
What test was used to establish that you used not to have a protein deficiency? It might not be specific enough. Such tests aren’t routinely done here so I can’t possibly guess what was tested in your case.