I'd recommend reading the short story All the Myriad Ways by Niven ( https://archive.org/details/Galaxy_v27n03_1968-10/page/n31/mode/2up?view=theater https://ar

I'd recommend reading the short story All the Myriad Ways by Niven ( https://archive.org/details/Galaxy_v27n03_1968-10/page/n31/mode/2up?view=theater https://archive.org/details/Galaxy_v27n03_1968-10/page/n31/m... ) and Anathem by Neal Stephenson (which is much longer than a short story). Also on the subject, https://en.wikipedia.org/wiki/Quantum_suicide_and_immortality https://en.wikipedia.org/wiki/Quantum_suicide_and_immortalit...