It’s possible to import your save in Diablo 2 if you are one of the people who never stopped playing or just kept their character saves all this time.
This can be good to recall fond memories in Diablo 2: Resurrected, or just get a significant headstart by importing your favourite class and resume where you left off.
This page explains how to import saves in Diablo 2: Resurrected as well as how cross progression works so you can make use of cross-progression and share your characters between platforms.