Step 1. Get an account.
First, you're gonna need an account that has no history of posting anything related to the actual facts of vaccination or anything that goes against anti-vaxxer's delusion that they are somehow critical-thinkers in a sea of sheep and shills.
If you need to make another account, you can easily do so through various services at the cost of a few Steem or you can just use Google Voice or a free SMS site (Although, this is a bit harder as many of them have already been taken).
Got an account ready? Good, now we can move on.
Step 2. Come up with a story.
All these anti-vaxxers really want to hear is a story that will confirm their delusion. I'd recommend keeping it fairly simple by saying you have a kid that has been "vaccine-injured" (They really love using this term) or you currently take care of someone with autism (They'll likely assume it's because of vaccinations).
Don't worry about providing proof or any evidence whatsoever, these are very gullible people who will gladly give you steemit upvotes for your experience. Afterall, they have and will claim that "You can't argue with someone's experience" (That is unless your experience happens to not agree with them, but I've already talked about that in previous posts).
Done yet? Good.
Step 3. Copy and paste your story on anti-vaccination posts
You can easily use the tag 'vaccines' to find a plethora of anti-vaxxer circle-jerking. But, you might notice that some posts are less profitable than others. Some get $100's others are unable to break $1. Now you could post your short story on all of these posts, and you will likely catch a decent amount of upvotes, but it runs the risk of being noticed and lead one of the larger whales to go into your history to flag your previous posts.
Instead, I recommend limiting yourself to a few slightly larger posts. Take for instance the users @canadian-coconut and @kafkanarchy84, they are very gullible so stick to their posts. If one upvotes you, then their followers will likely do the same.
Keep in mind a single 5% upvote from @canadian-coconut is worth almost $2 on its own due to the inexplicable 400k SP that they have been delegated with.
Step 4. Extra Credit
For bonus points, you can also post about topics such as paganism or homeschooling. It will make your story seem more believable and may make these dumbasses more likely to upvote you. Might as well throw flat earth into the mix as well.
Step 5. ?????
Step 6. Profit
After waiting 7 days, you can now reap the rewards and use that SP to upvote your own content and sell off that SBD for BTC over at poloniex.
Proof of it working: