I'm not the GP, but I can answer this.

I did try keto before. Heavy protein, low carbs. Everyone promised a high protein/fat/fiber diet with low starch/sugar was the secret to feeling full sooner and for longer.

Nope. Didn't change a damn thing. I was still hungry all the time.

My experience mirrors the GP. Ozempic really flipped the switch. See my other comment (https://news.ycombinator.com/item?id=50399564) for more.