dont be leecher or you will get ban
-Target account must have <10k followers, the fewer the better
-Target should have a human profile picture (i.e. a picture of a human)
-Instagram account with over 30k followers (can be fake, process is automated the majority of the time)

Steps:
Change your account name to something closely resembling your target. So if your target is hhh, change yours to hhh_ or hhh1. Change your account picture to theirs, and if you're feeling super excited upload a couple of their pictures to your acc. also.
Fill out this form for impersonation: https://help.instagram.com/446663175382270
Wait patiently