very simple solution: Please do not self-vote with steemzzang account. Do that persistently for a few weeks and post good original content and you won't be downvoted.
Just because you bought some steem at the wrong time, gives you no special privilege.
Complain about downvote, especially being the owner of a large account, and you SURELY will be downvoted. Downvote is people's privilege to challenge abuser, just like you.
This post of yours will be downvoted.