Can the Vaxxed become Unvaxxed?

Plenty of quality reading, no crackpot or holistic healing sites linked I'm afraid.

https://www.health.gov.au/initiatives-and-programs/covid-19-vaccines/is-it-true/is-it-true-can-covid-19-vaccines-alter-my-dna
The Pfizer/BioNTech COVID-19 vaccine uses a fragment of messenger RNA (mRNA) to instruct your body to make an immune response against COVID-19. There is a crucial difference between mRNA and DNA. DNA, which makes up our genetic code, is larger, double stranded and very long. The mRNA is a single stranded copy of a small part of the DNA, which is often released to send instructions to other parts of the cell. DNA is stored in the protected centre of our cells – the nucleus. The mRNA is broken down quickly by the body. It never enters the nucleus, and cannot affect or combine with our DNA in any way to change our genetic code. Instead, COVID-19 mRNA vaccines teach the cell how to make a protein that triggers an immune response specific to COVID-19. The vaccines work with the body’s natural defences to develop immunity to disease.

https://www.uwa.edu.au/news/Article/2021/June/Can-mRNA-vaccines-affect-my-genetic-code
Both the Pfizer and Moderna vaccines are mRNA vaccines, which contain tiny fragments of the genetic material known as “messenger ribonucleic acid”. And if social media is anything to go by, some people are concerned these vaccines can affect their genetic code.
Here’s why the chances of that happening are next to zero and some pointers to how the myth came about.

https://www.uq.edu.au/news/article/2021/07/no-covid-19-does-not-enter-our-dna
Professor Geoff Faulkner said his team’s research published in Cell Reports showed there was no evidence of COVID-19 – or the Pfizer or AstraZeneca vaccines – entering DNA.

https://www.nature.com/articles/d41586-021-02483-w

https://www.mcgill.ca/oss/article/covid-19-health/evidence-coronavirus-can-mess-our-dna-far-convincing
A newly published study claims SARS-CoV-2 RNA can integrate into our genome, but the evidence is questionable and the plausibility is extremely low