Regular incognito mode won't cut it here, because websites track your digital footprint: your IP address, cookies, and device information. You need to use anti-detection browsers and high-quality proxies so that each profile appears to the system as a separate, real person using a different computer. Check out these helpful tips at this link https://blogdunumerique.com/comment-gerer-plusieurs-comptes-en-ligne-sans-se-faire-bannir/ it explains in detail how to set up the process and protect your network of accounts from getting blocked. And for which platforms are you creating them—for arbitrage or purely for social media?