Never came across this indexing issue

I’ve been running a website since October 2023 and everything was fine. Until on October this year I decided to transfer the domain authority to my name and shift the hosting to the one purchased by me. Furthermore, I changed the theme of the website and along with it updated several of its articles to increase the word count. And when I checked again on Google only the home page and a tag page is indexed rest are not. Did everything I could and everything looks fine but Google still won’t index it. On GSC it says ‘Crawled: Currently not indexed’ What could be the problem here?