Try using 2 or more log-in accounts on Windows. Then you'd also need to use a different IP addresses for each eb.account, change Mac address,... There could be more: includes new name and address, bank account, paypal account, lots of luck and know-how, ...
Use 2 different Windows installations (on different partitions ofc) on the same PC, and rest of the above...
Or use another PC system and another net provider for that system, new address, etc.,... lots of luck and know-how, etc.
I'm still not sure if those methods would still help you in either short- or long-term. Ebay, I think, knows all those methods and have their own method to shut the accounts down.
And anyway, almost everyone who attempts that (spare the top BH'ers) do a mistake or two sooner or later and then get the ban.