Nature designed the shit outta kratom.
On topic: absolutely nothing. The vast majority of the time I'm sober unless I'm with people. Even then it's usually just weed, rare alcohol use maybe a few times a year although I had a good stint a few weeks ago. Psychedelics a few times a year. The great thing to me is that I don't NEED anything. I can go forever with nothing and while I'll miss it, I'm not sitting there craving it and having the lust for it consume my mind. I like my sober mind and I like myself and I see no reason to get outside of that too much.