Probably the single most important thing to actually stay off opiates is to restructure your life to fill the void that opiates left. Generally people get addicted to opiates in order to fill some void in the first place. For me, I started them just because I like to experiment with drugs, but I quickly discovered that they allowed me to hide from my abusive relationship that was getting increasingly worse, and numb myself to it so I could tell myself everything was fine. After years of that, I had no idea how to face my life without them, I became so depressed I wanted to die because I could no longer deny how terrible my wife was. When I was finally able to stay off opiates, it was when that relationship finally ended and I let it go. Additionally, I realized I had let myself stop playing music, hadn't touched a piano in 10 years but it's one of the most important things to me in my life. I started playing music again which produces a lot of joy and fulfillment in my life. The feeling of playing music in my band is better than the feeling of opiates. I got back involved with various things to fill my free time, so I wasn't sitting around bored and thinking about opiates. Every time I quit before, I didn't do that, so I'd just be sitting around bored out of my mind, because all the time I used to spend high on opiates I would spend not high on opiates but not really doing anything, so of course all I could think about was opiates. Basically, it's very important to identify things that are causing you pain and not working for you in your life, and cut those out. And also identify things that are missing and work to enrich your life with those things.
Another thing that is super important is to exercise. Working out is the single best way to speed along your recovery. it produces endorphins which are the body's natural opioids, it's why we have opiate receptors. By blasting yourself with endorphins from exercise every day, your body and mind will regain balance without opiates so much faster. Plus afterwards, every time, you feel better. it helps with the depression and the restlessness. Plus, being in shape makes you feel good in many other ways.
If you can provide a better baseline for yourself by doing these things, it's a lot easier to jump off of opiates and deal with some withdrawals. You probably aren't going to have very bad ones considering you tapered so low on methadone and haven't been using kratom long.