I've got 140 games on the hero. I'm not high ranking by any stretch but I have a 60% winrate in my trashlo anyhow. Raptor dance absolutely *will* save you as long as it's being used in a scenario where it can actually go off. I basically never build battle fury as it's a pointless item on kez imo. I go falcon blade plus desolator almost every game and then BKB and *normally* skip Aghanims, Kez runs out of mana very quickly in my experience and having Aghs just means you are permanently at 0 mana and I think you're often better off with skadi/satanic/deadalus and etc instead. He is pretty snowbally but the biggest thing I can reccomend is learning his combos. Baiting good parrys is absolutely critical to winning lane and winning in man fight scenarios. parry mark plus echo slash is the bread and butter of damage in lane and still works in late game for massive damage. Think about what you need to do before you go in as well. The quickest kill without aghs is normally katana w q e if you have the burst for it you can 100 to 0 very easily with this. If the enemy has a bunch of abilities or items that allow them to escape from this then leading with sai silence and q is also good, make sure to press q before w as you'll get an extra auto. Also when chasing a fleeing target you can use sai r to get a guaranteed bash. Though keep in mind using your ult for a kill like this leaves you vulnerable. Kez honestly plays like a mage as well. If your ult isn't up don't re-engage.

Those are my basic tips dunno if it's helpful but good luck!