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The best way to avoid ever being blocked is to make yourself involved with every single administrator on Wikipedia. According to Wikipedia policy involved administrators "should not act as administrators in cases in which they have been involved. This is because involved administrators may have, or may be seen to have, a conflict of interest in disputes they have been a party to or have strong feelings about." So the only thing you have to do is to start disputes with all administrators, and then the administrators would not be allowed to block you.
If you are to miss one administrator to start dispute with, and this one will block you, there would be nobody to unblock you. That is because only uninvolved administrators are allowed to act on unblock requests.
One of the incidents you create in order to involve administrators may end up getting you blocked.
Even if you do succeed at starting disputes with every single administrator, one of them will block you. You may complain that the blocker is involved, and you will be right of course, but at the end of the day nobody will sympathize with you and so you will remain blocked.