Hmmm... Step number one is admitting you have a problem, that you're an addict. You've come this far, so good on you. I think we can help.
First, Excel is your friend. Use Onedrive or Dropbox and you can keep an up-to-date spreadsheet of your knives on your phone at all times, so if you're out and about and see a knife that interests you, you can immediately check if you already have it. Using Excel lets you create custom tables, sort by lots of criteria, and create pivot charts that will tell you exactly how bad the addiction has grown over the years.
Second, make sure that your spreadsheet contains up-to-date info on knife conditions. That way, if something bad were to happen, your next-of-kin will be able to get good value when they sell off the collection.
Lastly, and perhaps most importantly, check that your homeowners' or renters' insurance has a rider that covers loss of knives due to theft, fire, or act of god. Too many policies don't cover high-value losses, or don't cover collectibles at all.
Remember, there's no such thing as an ex-knife-addict. You're always going to be a knife addict or a recovering knife addict. So long as you keep your collection managed and under control, it doesn't matter how large it gets. Just keep at it one day at a time, there's always a sale going on.