I mostly agree with what ShimmeringKoi said. You’re not doing it wrong, but the quality of kratom varies wildly, and it’s almost always garbage from a headshop unfortunately. Those stickers don’t necessarily mean a godamn thing. Since you’re here, you know how much product quality assurance actually means in general. We can’t trust that our food isn’t fucking poisonous and kratom is a barely-lighter-than-grey market unregulated drug. Still, even if it’s shit quality, you’re right you should be feeling something. The THC high can definitely block it, but if you have no tolerance (to opiates I mean) then 7g should be getting you somewhere even if it’s just a mild glow. You could just be a hard head and need a bit more though.

A few considerations: If you do have any kind of opi tolerance this will make the kratom almost useless unless you take quite a lot of it. Assuming that’s not the case, if I were you I would continue to up your dose little by little but you may have to give up and wait a day or two and then try again at a slightly higher dose. You might try changing up how you take it too. Mix it up with a little lemon juice as a tea and drink it slow; if you’re already doing that, try instead downing it via toss’n’wash (carefully, and yeah most agree it’s gross). If you are already doing it as tea, don’t boil the kratom itself as that can destroy some of the alkaloids, but pour the not-boiling but scalding water over it and mix.

If you are one of the rare people who just plain can’t get anything from it (it’s not totally unheard of) then maybe be glad. It’s certainly not the worst drug when it comes to addiction, obviously. Sorry for the unsolicited part of my advice, but if you are opiate-naive, it may not be a bad thing to keep it that way. There have been many poor souls who were truly shocked by how much a seemingly innocuous drug like kratom was able to take hold. Be careful. Especially if you do end up enjoying it and wanting to take it more than a couple times a week, it would be a good time to think about setting some rules for yourself or just sticking with good old THC.