how to move these vertices out evenly ok, I don't know how to ask this question properly which is why I couldn't find a solution on google.

basically, I want just the middle vertices to pop out evenly that way I could give it a half circle depth. I included a picture to help make sense of what I'm trying to ask.
Thank you in advance!
The command you need is 'shrink/fatten' which shortcut is Alt+S :



Once done, you can tune it with the operator panel on the left, and check the 'offset even' option which gives a more even... offset...