If my gums recede, can they recover?

Recently, while looking in the mirror, I felt like my teeth looked longer than before, so I took a closer look and it seems like my gums have receded a little.

I'm worried because sometimes I bleed when brushing my teeth, and my mouth feels sensitive when I drink cold water.

I looked it up and it's called gum recession. I'm confused because some say that once the gums recede, they are difficult to recover naturally, while others say that with proper care, you can prevent it from progressing further.

I am especially curious to hear the experiences of those who have received treatment for significant gum recession.