This professor disagrees with you: https://zoe.com/learn/podcast-should-i-eat-more-protein

I can't really cite a specific portion, as he explains how the whole RDA works, how much we eat and how plants' amino acids work across the whole length, but frankly, the whole podcast/video is worth listening to.

But well, to cite at least the conclusion:

Yes, you can absolutely meet all your needs on a completely plant-based diet, stop obsessing about protein.