One possible solution is to try using a different proxy or VPN service that is not currently detected by Instagram. You can also try adjusting the settings of your current proxy or VPN to make it less detectable. However, these solutions are not guaranteed to work and may even be considered unethical or against Instagram's terms of service.
Another option is to use the platform without a proxy or VPN, and instead try to work with your ISP or network administrator to resolve any network restrictions or issues that may be preventing you from accessing Instagram. This may involve requesting changes to your network settings, or seeking alternative ways to access the platform, such as through a mobile device or public Wi-Fi network.