I like to smoke pot so it is just so relaxed in the evening when you are in bed and netflix.
But it can't go on like this I promised my father that I would quit. That was a lie, of course, but I definitely want to reduce it
Find another vice bro
Start easy. Reduce it more and more over time.
Tell your friends you want to withdraw and they shouldn't give you stuff anymore. If your dealer is a cool guy, you can tell him that too. This way he won't be able to deliver grass to you anymore.
A cold withdrawal would also be an option, but there's a chance of relapse.
Find something else like playing on it you can switch
Find a balance and distraction. Do not hesitate to keep asking for more. Start with sport, preferably so that in the evening, if you would normally smoke in, you are already exhausted that you no longer want to smoke because you would immediately fall asleep anyway.