Can my uneven nostrils be fixed? Will alar base reduction make it worse? (photos)

Thank you very much for posting your pictures. In my experience revision rhinoplasty needs special attention in assessment of scar tissue and availability of cartilage for grafts.In fact the healing process in this anatomical area is quite unpredictable and supporting the structural frame with solid grafts is essential.Otherwise I think that your expectations are realistic...I am not sure about the alar base reduction but this should be confirmed only after an accurate assessment.With best regards,

Your morph appears realistic, however your main issue is overprotection of your nasal tip, nostril asymmetry  and alar collapse, which would not be corrected via an alar base reduction. Difficult to say with certainty from these photos alone, but you need to consider tip deprojection techniques, alar cartilage batten grafts for support, columellar modifications and possible soft tissue adjustments at the alar base. Deprojection of your tip with improve your infra-tip lobule to columellar ratio and along with cartilage grafts improve the shape of your basal view. Careful consideration regard further improvements of an already nice result should be approached sensibly and cautiously. Hope this information helps in your plans. Best wishes.