I was forced to withdraw from venlafaxine cold turkey a few years ago because I lost my insurance, and could not afford to buy the medication. It’s very difficult, and it takes a few weeks. (Our lovely US health system:()
Look into benzodiazepine withdrawal techniques. There are many YouTube videos that you can utilize. There is a method developed by a doctor in the UK for withdrawing in microdoses. You might be able to work with a compounding pharmacy to very very slowly withdraw from this medication.

Good luck, if you have any questions let me know