Yes, I see this efforts and regularly add my upvote to intro posts, there are also introduction and introducemyself tags used more sparsely. However this, and love sniper efforts to share this posts is basically it.
Data shows it's clearly not enough, retention is still low, and as long as new people won't be able to meet their friends here, we need to create as much welcoming and helping environment as possible. We can create first impression only once.