@Ma'am-I-Am - If you have access to a recent version of MS Word, try opening the PDF with it, Save as DOCX, and then convert that to EPUB.
My experience is that it's often faster - i.e. 5 minutes to convert rather than two hours, and the result is often better… i.e. a more accurate representation of the PDF
Some 'glitches' are easier to correct in Word than in an EPUB Editor… e.g. section headings.
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