I knew I needed to for years - and wanted to. I had a few sober periods of more than a few weeks.
The turning point was a few years ago: I was drunk, fell and taken to the ER where I was Baker acted for 3 days. I was furious about that then actually glad as I stayed sober almost a year and realized how nice it was.
This time, my daughter moved in with me and announced I was quitting. I wasn't "ready" in my mind but knew I needed to take advantage of this "help". I haven't had a drink in over 2.5 years.
If what you've done in the past hasn't worked, find another solution but know that there is no secret trick, vitamin or quick fix.