Some of your headlines include the word “snoezelen” and others don’t. Does your audience know what snoezelen is? Would they look for advice on snoezelen in Google? If so, then you may want to leave it in your headline as it makes it more specific.
I like #4: How to relieve your autistic child’s anxiety and help him open up
=> Relieve and anxiety are power words; and you’re including two specific benefits – relieving anxiety and helping your child open up.
#12 is good, too: 13 simple ways you can use snoezelen at home to help your autistic child open up
=> You can shorten this: 13 Simple Ways Snoezelen at Home Can Help Your Autistic Child Open Up
=> Or even: How Snoezelen at Home Can Help Your Autistic Child Open Up
If people know what snoezelen is, but don’t know how to create a snoezelen spot or are afraid it’s too expensive, then #3 can work well, too:
7 steps to create a peaceful Snoezelen spot at home for your autistic child
=> or: 7 Steps to Create Snoezelen Bliss at Home (Without Breaking the Bank!)
=> I’m not sure you need “for your autistic child”?
Enchant readers. Woo customers. Win business.