To avoid Reddit device bans, a system of deploying sacrificial accounts can be used.
Reddit uses fingerprinting to determine linked accounts based on network information, browser configuration, operating system configuration, and behavioral patterns.
To evade fingerprinting, make it look like the accounts are on different devices and ensure that the accounts behave differently from each other.
Deleting as many posts/comments from banned accounts might be a good idea to prevent identification through writing style/content in the future.