Regain access to a hacked instagram account

My Instagram account was recently hacked by someone else and I can no longer access it. I have attempted to contact Instagram support but the suggested solution did not work. Unfortunately, the hackers have changed the email address on the account so I am unable to access it from the original email. I am in need of help from an experienced freelancer to regain access to my Instagram account and put in place measures to prevent it from happening again in the future.