Unfortunately, one of the only things that is proven to convince vaccine skeptics is when someone from their community dies of a preventable illness.

This is a great book on this topic: https://www.amazon.com/Anti-vaxxers-How-Challenge-Misinforme...

Also, what's the overlap here between people who believe a) the unborn have a "right to life" (or forced birth as some others call it, where the parent has no choice but to take the pregnancy to term and give birth), and b) those who think the parents have every right to decide not to vaccinate their children? If you believe (a), shouldn't you believe (not b)? And if you believe (b), shouldn't you believe (not a)?

Another thing that seemed to work is the unvaccinated getting sick themselves.

2/3 of the unvaccinated COVID patients who were admitted to hospital regretted their decision, declared they would promote the vaccine post-discharge, and declared they would get it post-discharge.

https://pmc.ncbi.nlm.nih.gov/articles/PMC8950102/

It seems like even that's not good enough. I have a few skeptics in my family and have had family members die from covid.