Preventing Underarm Odor?

I've tried a lot of anti-perspirant, deodorants, alum/deodorant crystal, and natural remedies like lemon and baking soda, but it seems like they all don't help prevent my underarm odor. What should I do? I am so confused. I am using vinegar and it works for me as of now. But are there any other products or ways I should use or try? Thank you.