If you downvote posts that already has larger stakeholders downvoting, nobody will notice you. I think you should use your downvotes.

You can start with this profile: https://steemit.com/@maykolcontreras. I am downvoting the oldest first (3 days old) After a couple of downvotes on my comments it is just passive now. It is a puppet-account milking the rewardpool.

You can also use this page to go after the trending page. If there already is large profiles downvoting you will be in no danger.