Have people wondered about a possibility of an advanced life form hiding inside a star? It doesn't seem easy, but there'd be an abundance of energy, and the less advanced life forms are unlikely to interfere.
I found the part about the possibility of life on neutron stars to be fascinating.
Then you will love "Dragon's Egg" by Robert L. Forward. https://en.wikipedia.org/wiki/Dragon%27s_Egg
Stanislaw Lem's short story "The Truth" https://thereader.mitpress.mit.edu/the-truth-by-stanislaw-le...
It’s also fun to think about how hard it would be for us to detect such life forms
The Saga of the seven suns has beings living in suns. Unsure how far they go with the idea,I'm missing 3 of the 7 books
Revelation space has got the Amarantin living has simulations inside a neutron star.