My first child stop using pacifier just before she turns 4 years old. What I did was I told her if the pacifier tear into half no more buying new ones, shop doesn't sell anymore. I persuaded her that she's big girl and no more pacifier. Indeed it is tough, she suck on her thumb on and off, she bite her favourite toys ear to sleep. It took her weeks to have the mindset that I told her. I kept convincing her, pacify her and eventually she didn't ask. It has been a month of no pacifier. I also reminded everyone around her including my spouse to remind her that shop doesn't sell and she's a big girl hence she can't ask for it.
This may/may not work for you though. My parents thought me some old tips but I did it my way.
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