Magus struggles

So I’m a level 7 dex based Bladebound Magus and I’m struggling to hit with my Rapier. I have fencing grace and finesse/focus. I notice the samurai and gunslinger are outpacing me in combat. I keep seeing people say level 7 is where Magus really comes alive but maybe I’m missing something.

Also we’re playing a loosely inspired one piece themed PF1e campaign. Any tips or class change ideas?