Successful ways you have quit/known others to quit?

Hey guys,

I am a young guy in my late 20s who has been wanting to quit drinking for a while now. I have tried here and there hard alcohol fasts, but the temptation is still there. I have gone so far as trying THC beverages (as they are legal in my state) and they do seem to help, but for my job that would be a firable offense if they knew I did those on the weekend.

Anyhow, this week has always been a challenging week as 11 years ago this Wednesday, I lost someone who quite saved my life, rather unexpectedly. That said, I know alcohol around this week has always been a crutch and I am trying to hard to fight the urge but I need new ideas. I work with someone who is probably a functioning alcoholic and it is tough for me to survive in that environment. I need advice/tips to quit.