I have known people to get into buprenorphine IOP programs to treat their methamp use disorder with good results. Of course, there are a lot of risks to using buprenorphine for this purpose, namely dealing with the associated dependency of it if you ever want to come off it or try something else. But if the methamp habit is causing you enough harm then at a certain point the buprneorphine makes more sense as a potential solution. Only caveat is that the people I know who have tried this approach had had a prior substance use disorder with opioids too, even if methamp had since become their only DOC.
What about kratom? There is the serious risk of addiction developing with that too, like tramadol, but at least with kratom it is legal (or at least in some places it is), it has a sort of ceiling dose and doesn't have as much of a seizure risk compared to tramadol. All in all I can't recommend kratom because of the potential for habituation related issues, but, like buprenorphine being used, if the methamp is causing enough harm then at a certain point it is worth looking into it. At least kratom is easier to come off than buprenorphine (it is in no sense "easy" to come off, just relatively speaking likely to be a bit easier than a dependency on buprenorphine).
What about cannabis? That has become recreationalized in many places and is medicalized in most. Certainly it would have the potential for less issues with use disorder than methamp, tramadol or kratom.
Bupropion has been helpful for some people in terms of managing cravings for methamp. You might want to look into that before trying something more drastic. Likewise you might try other antidepressants if bupropion doesn't help.
Gabapentin is use more as a mood stabilizer now, so that would also be worth looking into before trying something like kratom/tramadol/buprenorphine. It has the potential for a problematic dependency itself, but its general tends to be associated with less harm than the other substances mentioned.
I'd suggest look into bupropion and/or cannabis first. Which brings me to the take away from this: work on this issue with a medical professional who specialized in working with people with methamp related disorders. That is your best bet in all of this I think.
hows about coffee, god and cigarettes?
LOL