Stopping insulin is sometimes possible if an individual has not had diabetes for more than 10 years and blood sugars haven't been too high for too long. Taking strong measures to reduce insulin resistance, such as losing weight, increasing exercise, treating infections, addressing the causes of chronic stress and pain, treating sleep apnea and, if possible, getting off of medications such as steroids If a patient is on basal insulin and doesn't need mealtime coverage, taking these measures will reduce, and sometimes eliminate, the need for injecting insulin.
I suspect (assume) you have type 2 diabetes. In this case, the most common cause is underlying obesity (excess fat tissue). For many people with diabetes, weight loss can reduce their medication, including insulin dose. I have been surprised at how many people will make lifestyle changes and no longer require as much medication/insulin. The chances of making your diabetes / insulin "go away" are best if you lose weight (sometimes through bariatric surgery).
I would NOT recommend stopping medication outright. However, in reducing sugar intake and losing weight, you may notice day to day glucose checks getting lower and lower. Eventually, it may get to a point where you can move back to pills or nothing at all.
It is not 100% permanent depending on type of diabetes, duration of diabetes, quantity of insulin units / dose, family history, etc. Many factors contribute. Most important is to keep your sugars "out of the danger zone" to prevent complications like eye disease, kidney problems, and nerve issues. This is by average sugar less than 150 or hemoglobin A1c under 7% (in most cases).
Nothing is permanent. Nothing is permanent.
I hope you're able to find success! Great question!