The way I learned to deal with avocado pits (while working at a Tex-Mex restaurant) is to chop straight into it with your chef's knife, then twist. It seems dangerous since you'd be holding the avocado half in your other hand while you do this, but it works pretty well.
I think it was almost what I tried to do, but without the skill I guess 😅 coincidentally, I remember that the day after I did it, I saw an article in the media explaining how many people are doing the same mistake and stab themselves. Avocados are deadly weapons xD