Best tips to quit permanently

Looking for advice on what helped people here quit permanently.

Back story - I’ve known for probably 5 years that I need to stop drinking or it would cost me my relationship, but I’ve routinely quit for 2-3 months and then eased my way back in and been fine until one night I get way too drunk and do something that makes my wife want to leave me.

I need this to be the absolute last day 1. Looking for what helped people most.

Thank you all in advance.