First of all, congrats on getting out of your drinking hole, that's a great accomplishment.
However I do think there will be a crash eventually. Phenibut is an amazing substance but if you take it every day, if you ever have to stop you'll be in for a hard time. Also you may need to slowly keep increasing your dose and eventually you'll be taking a lot more and it won't work as well. Same with kratom. Kratom is an opiate, since it hits the opiate receptors. Daily dosing of it will cause physical addiction. People also tend to slowly increase their dosage with kratom/opiates also, because you build tolerance and you need more to get that same effect.
Weed doesn't cause physical dependence, so that's the only one I can say you could probably maintain. I know people who quit heroin or alcohol and smoke weed daily now and live productive, happy lives. Of course, any drug can be a crutch so make sure you're not doing nothing but smoking weed, or noticing problems in your life because of weed. That would be a sign you're using it in an unhealthy manner.
The best thing for you to do would be to use phenibut and/or kratom much less often. It's amazing that they've allowed you to get out of your old lifestyle. If you can slowly reduce your usage of them, you'll be on the road to being able to deal with your issues without substances, or at least without substances all the time.
Realistically, you shouldn't just quit suddenly. You may have dependence on the kratom and you almost certainly will on the phenibut. Withdrawing would probably be too much for you to deal with considering your recent lifestyle change, so if you can just really try to at least very slowly reduce the amount you're using, I think that's a good place to be at for now. That way, you'll eventually be able to transition off, and just as importantly, you won't be slowly dosing more and more until you end up in a bad situation (years into it, completely reliant on both drugs, perhaps kratom stopped working so you switched to heroin, etc. Shit happens that you never expected to, as I'm sure you know. Just be careful).
