Can a person restore the number of plants that have become rare?

Rare species are a few species of organisms that cannot yet be classified as endangered or vulnerable species. Accordingly, given that the number of such species is small, certain measures are taken by the relevant nature conservation organizations to conserve and increase in relation to them. For example, they are entered into official documents protected by legislative bodies, their habitats can be classified as protected, which makes it possible to limit anthropogenic influence.