I've written heaps of 'self-help' articles over the years and don't feel guilty about any of them because when I write I write for myself.
I write self-help articles as if I'm talking to myself; giving my self a little pep talk, clearing my thoughts or planning out some new lifestyle choices/habits.
As you mentioned in your piece, if you're truly honest with yourself and authentic in your writing then I believe there is no topic you can't cover.
Nice article, thanks for sharing your thoughts 👍.