Sorry, I mixed something up. I've been in IT school for 9 months. It's limited but possible to change IPs. For example, I work with a router setup that assigns a new public IP every time it restarts (manually or automatically). Depending on how many accounts you want to use, this method becomes impractical, but on a small scale, it works , especially if you have 2-3 additional SIM cards for mobile phones. As long as they stay connected to the network, they keep the same IP, but a restart results in a new one.
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If you buy proxies, it’s never really worth it since about 80% of them are flagged. Personally, I think it’s just a cycle to make money.