For me, it's probably a toss up between Sekiro and Bloodborne. I've finished the games in their entirety probably around 4-6 times - either for their respective endings, just for fun, or trying to do a challenge run, like a BL4 Bloodborne run. Lies of P follows them closely at around 4 and soon 5 once the DLC rolls around.
Bloodborne and Sekiro were my first two soulslikes, and once it clicked, I was obsessed with both. I got platinums, watched video essays, listened to the OSTs all the time. They're very near and dear to me.
What is your most-played soulslike?
The story combined so well with the gameplay, I love it. So I've stayed away from Hades 2's early access so that I get the full experience the first time I play it.