Right, but unlike you (and I'm not knocking you in any way) I'm not dependent on Kratom. You've been taking it for 7 years but I've only used it on and off. I really use it relatively rarely but I used a lot years ago. There were periods where i just took more and more to try to get an effect and I'd continue to as I raised the dosage higher but of course that did come with withdrawal. Then I stopped numerous times and once for well over a year and returned to it without a tolerance and it still worked. Now it does not work.I've been on kratom for years and years now daily and can't get off it. Kratom is not a hard narcotic so its not too concerning but it still hits me well. It is not like the beginning but I definitely feel euphoria from it. I think what has helped is that I never took huge doses. If I don't feel it *at all* like you are experiencing, I'll instantly just cut back so I can combat withdrawals but stop trying to get high off it for a couple of days. Usually, I've found no noticeable withdrawal to cutting back greatly. Maybe a slight depression sensation that if I paid attention enough I could notice.
The good thing about kratom is that you can drop your doses very low--just enough to keep the withdrawal at bay--and still be fine. With morphine for example, should one cut their doses back in this same manner--you're going to feel like death and experience very unpleasant physical and mental symptoms. Try cutting back for a while, bite the bullet and see if after a few days the old doses hit again. There's really not much else I can think of. Embarrassing to say that I have been on kratom for 7 years straight now, and dared never miss a day. It is not the kind of drug you can try to get as high as possible on. Its more of a subtle, light euphoria that does return if you moderate your doses to be quite low when you reach that ceiling and then up the intake again.
There is no point in reaching a ceiling effect where no doses are possible to be enjoyable and keep trying to surpass that wall. While kratom is not an opiate per say (depending on which angle you look at the substance from), too many people pound their brains with opiates after that "I don't get high anymore" part of their dependencies, and never make any alterations to their using pattern to allow the euphoria to return. You're going to have to relinquish something for a temporary time period to achieve the same pleasant auras that you once did.
So, yeah, I tend to think that unfortunately it's probably never going to work for me again, which really kind of bothers me. With my unique issues nothing felt as good as Kratom. I guess I can try it once in a while and see what happens, but mostly I guess I'm probably best off not thinking about it.