You should model your behavior on the assumption that you will not be accepted anywhere and work on improving your application's shortcomings. This is NOT to say this is what I think will happen -- just what the most productive course of action will be in the event you do need to reapply.
So -- If your
LizzyM is 76, your 'weak spot' will not be your academics or MCAT, so no need for action there. If you've done ZERO research, that's something to add, because most schools that you'd normally apply to with a 76 LM will be research-heavy. But that's only if you're truly WEAK on research. If you're a socially-uncomfortable introvert who already has substantial lab time, do NOT focus on adding more.
The more likely scenario is that it's your ECs and the interview. Fortunately, volunteering is the easiest hole to fill. Make sure you've covered the 40-hour shadowing core including shadowing at least one primary care doc. Then look for opportunities to volunteer. If you've got long-standing volunteering already, pump up your hours to show more commitment. If you lack clinical exposure, get some! Above all, don't lose time waiting for a traditional hospital volunteering gig. First off, they're usually pretty worthless. Second, if you're in a nice suburb, there's often a long line of pre-meds ahead of you. Third, they impress no one.
So look for opportunities that make people uncomfortable or that get your hands dirty -- free clinics, nursing homes, hospice, homeless shelters, prisons, memory care units, working with people with disabilities. Those kinds of programs really need the help and are much more impressive to AdComs. They'll also give you things to talk about in your interviews. If you're uncomfortable socially, try working with teens or young adults on the autism spectrum. You'd have a lot to offer that population and may find it beneficial to your own social skills.
And finally, take a close look at your school list and make sure it's appropriate and that you applied early enough. Seven interviews doesn't ring alarm bells, but you'll also want to check for mission-fit.
Good Luck!