The Problem of Creating Another Account After We Suspend Your Account and Its Exact Solution
After your Instagram account is suspended for any reason, if you try to open a new account from the same phone or the same internet network, your newly opened account will be closed within seconds. The error that appears on the screen is "Creating another account after we suspend your account".

Why Does This Happen? When Instagram suspends an account for violating its rules, it blacklists that user's device ID (MAC address) and IP address. The system aims to completely remove you from the platform by saying "We have determined that you do not comply with our Community Standards." Your attempt to open a new account will be perceived as an attempt to escape the system.
Solution Method If you receive this error, the first thing you should do is stop opening a new account immediately. Constantly trying to open a new account will result in your main account being permanently deleted. The solution is not to open new accounts, but to unblock your first closed main account.
After filling out the standard objection forms to recover your main account, you can send an email stating that the situation was misunderstood:
To: support@instagram.com Subject: Unjustified Account Suspension and Device Flag Content: Hello, My main account (@yourusername) was suspended without a valid reason. While trying to understand the issue, I logged in with another account, which was also immediately closed. I am not trying to bypass any rules; I am just trying to access my personal data and contacts. Please review my main account and remove the suspension. Thank you.