+1 to pb4uski's comments above.
The limit is 7.5% of AGI now. And you can include all sorts of OOP medical expenses in addition to premiums to try to reach that number. Just not anything for which you've also obtained a tax benefit (so you can't include a medical expense on Schedule A for which you also reimbursed yourself from your HSA).
Most people, though, will still be better off with the standard deduction, because even if you make it above 7.5% of AGI on medical expenses, that amount (plus your RE taxes, charitable donations, etc.) still has to exceed the higher standard deduction. Which is hard to do for about 80% to 90% of taxpayers.
FYI there is a deduction (an adjustment, actually) for health insurance if you are self-employed. See line 16 of Schedule 1 and the related IRS instructions. Note that if you are self employed and on an ACA plan and receiving a PTC, and want to claim the SE HI deduction, the tax law has a circular calculation that is a pain to figure out.
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