Time passing and upvoting by you adds to score slowly. So rate of change might be interesting, if it is non linear perhaps you could snapshot your comments posts and upvotes and see if your bot theory is visible as very old posts and comments being acted on somehow.
I just upvoted this post and your score was 819 beforehand.
Did you comment on a story that went into the second chance pool?
https://news.ycombinator.com/pool
Sometimes it can be a few days before they pop up on the front page and people see your good comments. Good luck.
Maybe you got better at posting? :-)
Maybe someone upvoted one of your earlier replies. It happens.