I don’t know any school that doesn’t like reapplicants. Many actually value the persistence and determination a reapplicant shows. Unless your GPA and/or MCAT are well below average, your stats are not expected to improve. The adcoms will look to see what you did in your gap years to address the weaknesses in your first application. If stats were not a weakness, then it could be clinical experience, volunteering, research. If it were writing or interviewing, then you have to seek input from others, practice interviewing (if you had interviews in the prior cycle, you have gained valuable experience) etc.