Am I able to help my partner with their alcoholism?

TLDR: I’ve noticed how much worse my partner’s alcoholism has gotten, but anytime I’ve tried to talk about it in the past they just hide it more.
My partner of almost 4 years (we don’t live with each other) has always struggled, and it’s been to points where no exaggeration, they would get through enough for a party but just for themself in 2 days. Anytime I’ve spoke to them I have been as calm as I can to not shame or put them down, and some conversations go fine, others they just shut down. Over the years the ONLY time I lost my shit was when they drove around blacked out, like waking up confused not knowing how they’re in my house, pissed all over my bathroom floor because they missed the toilet blacked out. As far as I know that’s the only time they ever drove drunk but I’m unfortunately doubtful. A new issue is catching them hiding empty cans, empty shooters in their pocket, drinking in my parking lot thinking I wouldn’t see, and lying about stopping by liquor stores forgetting I have their location. And anytime they get caught red handed they double down and think they get sneakier but I still notice. It’s to the point where I can’t tell if they’re drunk or not. Sometimes they can admit they’re an alcoholic, but most of the time they get defensive or sarcastically joke about it. Alcoholism runs deep in my family, so I know the signs, I know the reasonings and excuses, hiding places, habits, but I also know the more people notice or point out the worse it gets. I want to help them, but is there a way to talk about it without continuing their shame spiral or making them feel like they need to hide it more? Or is this something I can’t help? I don’t have anyone in my life I can turn to who understand addiction and think it’s as simple as “just tell them to stop” and unfortunately the people in my life that do understand are either dead or still active in their addictions as well. I love my partner deeply and want to help them so bad, but it’s only getting worse and I’m getting to the end of my rope and don’t know what to do.